Oscar Grant was an unarmed black man traveling on the BART train in Oakland, California, on New Years Day in 2009, who was shot and killed by former transit officer Johannes Mehserle. The shooting, caught on a cell phone camera, went viral immediately and caused rioting in the city of Oakland. Last night, jurors in Los Angeles found Mehserle guilty of involuntary manslaughter — a sentence that carries jail time of two to four years. Grant's family, who had been hoping for a murder conviction, was upset with the verdict.

We're following up on a story we did yesterday, from the perspective of Chicago funeral home owner Spencer Leak Sr., about the challenges Chicago is facing in combatting gun and gang violence. On Monday, the Supreme Court struck down a Chicago ban on handgun ownership, a move that divided city residents. Some Chicagoans were thrilled, and say the ability to own a handgun makes them feel safer. Others say even more people will lose their lives. Why is gun violence such a problem in Chicago? The Chicago Police Department says that gang activity was involved in 74 percent of murders in the first five months of 2010. 80 people were shot and thirteen killed over the past two weekends in the city.

Yesterday the Supreme Court said the Second Amendment's gaurantee of the right to bear arms applies to state and local gun control laws, effectively overturning Chicago’s ban on handguns in a 5-4 decision. The ruling comes after two deadly weekends in Chicago, where over 80 people have been shot and 13 people killed in the city. For decades, Chicago’s homicide rates have soared above other U.S. cities. And gun control advocates worry that the recent Supreme Court case will escalate crime in the city and make Chicago the national epicenter of gun-related violence.

Puerto Rico has called upon 1,000 National Guard troops to help local police fight a rampant crime wave that has pushed the murder rate to a record high. In 2009 alone, 894 people were killed on the Caribbean island. The high rate of crime is being attributed to feuding between gangs battling for control of the cocaine and heroin trade. And the crime has not been restricted to metropolitan areas. There have also been reports of violence and murder in the mountain regions of Puerto Rico.

The United States is attempting to have alleged drug lord and gang leader, Christopher "Dudus" Coke, extradited from Jamaica. The announcement by the Jamaican government, Sunday, that they will cooperate with the U.S. has ignited a huge storm of violence that has left a reported 49 dead in Jamaica's capital city of Kingston. 

Anti-government unrest continues in downtown Bangkok and has spread to other areas of the capital, leaving at least 37 dead and hundreds injured in four days. On Sunday, the Thai government ruled out U.N.-backed mediation talks, which had been suggested by protest leaders; the government says no outside help is needed.  

For this week’s movie segment, we discuss the international film phenomenon, The Girl with the Dragon Tattoo. Already the top grossing film in Scandinavian history, the cold case murder mystery has opened in a handful of theaters across the U.S. over the past several weeks to enthusiastic audiences, stellar reviews, and rumors of a Hollywood adaptation.

On Wednesday, a suicide bomber killed eight American civilians in Afghanistan, according to U.S. officials. The incident happened at Forward Operating Base Chapman, which is located in a highly hostile area near the Pakistan border.  It is still unclear how many people were injured and whether or not the bomber was targeting the civilians, reportedly CIA employees.  With the latest is Marvin Weinbaum, former State Department analyst on Afghanistan and Pakistan, along with Peter Greste, BBC correspondent in Afghanistan.

Tuesday was one the deadliest days in Iraq since October, with more than 127 people dead after a series of coordinated car bomb attacks in Baghdad. The bombers struck after Iraqi lawmakers voted to hold parliamentary elections early next year. But are elections the best course of action for the volatile country? We get two views: from Rachel Schneller, an international affairs fellow at the Council of Foreign Relations; and Rusty Barber, director of Iraq Programs at the United States Institute of Peace.

Read Rachel Schneller's article, "Avoiding Elections at Any Cost in Iraq."

We talk to Amanda Lee, whose husband is stationed at Fort Hood in Texas. She gives us an insider's view on how the story of this tragic shooting is being heard by military families.

What drives a man, a psychiatrist trained in the stresses specific to military personnel, to pick up a gun and shoot fellow soldiers? We may never know what really drove Major Nidal Hasan to his crimes, but a portrait of the alleged shooter at Fort Hood in Texas is beginning to emerge. The Washington Post has a story which says that Hasan used to pray every day at the Muslim Community Center in Silver Spring, Md. Christian Davenport from The Washington Post joins us with more.

Here's the profile that the Associated Press has put together so far:

As the nation learns the details of the shooting on the Army base in Fort Hood, Texas, reactions are pouring in. To sort through the reactions we speak with Kate Dailey, health and lifestyle editor for Newsweek.com; our own Ibrahim Abdul-Matin on local Muslim reaction to the shooting allegedly by a Muslim soldier; and Ibrahim Hooper of the Council on American-Islamic Relations.

Here is President Obama's reaction to the tragedy:

Chris Haug is the chief of media relations at Fort Hood, Texas. He tells us how the Army base is trying to recover a degree of normalcy after yesterday's tragic shooting. The base will be marking the event with a moment of silence while the details of the tragedy continue to emerge.

A press conference at Fort Hood Army Base in Texas answers some of the questions stemming from yesterday's tragic shooting on the base. Major Nidal Malik Hasan, an army psychiatrist, is suspected of gunning down his colleagues, killing 13 and wounding at least 30. Officials say Hasan walked into a military compound with two guns and opened fire yesterday afternoon. He was shot and is in critical condition. We also speak with Dr. Brian Aldred, the medical director at the Emergency Center at the Seton Hospital near Fort Hood, Texas, about his hospital's response to the tragedy. Finally, we speak with Olga Pena, the managing editor of the Killeen Daily Herald, who has been following this story.

New details are emerging this morning out of Fort Hood, in Texas, where an army psychiatrist has allegedly killed 13 people and injured 31 during a shooting rampage. Major Nidal Malik Hasan is alive but injured after being shot by a civilian officer. We're joined by Ericka Aguilar, KUT reporter in Fort Hood. Matthew Cassese was stationed at Fort Hood in 2007 and 2008. He remembers a base that was safe, but says soldiers were frequently in trouble for drunken driving. We also talk to Detective First Grade Nick Casale, a former director of counterterrorism for New York City's subway system, about what is involved in a complex criminal investigation.

Here is a press conference from yesterday outside of Fort Hood. This clip shows how confusing it can be during a criminal investigation to get the facts straight. Yesterday they thought it was up to three shooters, one of whom died. Today we know it was one shooter, who is alive, but in critical condition:

Major Nidal Malik Hasan is the alleged shooter in the rampage at the Fort Hood Army base in Texas; 13 people are dead and 31 injured. The suspected shooter is an American soldier, a psychiatrist and Muslim. He had told relatives that he had been harassed for being a Muslim during his military career. To discuss how the Muslim community is reacting to the news we speak to Ibrahim Hooper, with the Council on American-Islamic Relations.

Thirteen people are dead and 31 injured after a soldier went on a shooting spree at Fort Hood in Texas. The Army base was locked down for much of the afternoon as authorities tried to determine the series of events that lead the suspected shooter, Army psychiatrist Major Nadal Malik Hasan, to open fire on his colleagues. Hasan was injured after being shot by another soldier.

To help unravel the story, we talk to Olga Peña, managing editor of the Killeen Daily Herald, who has been covering the story. For a soldier's perspective, we speak with Naveed Ali Shah, a public affairs specialist with the U.S. Army who was stationed at Fort Hood from 2008 to 2009, and whose wife and son are still there. Shah is, himself, Muslim; he joined us from Iraq. We also spoke with Andrew Pomerantz, a professor of psychiatry at Dartmouth University, who has worked with veterans with PTSD for 35 years.

The Mexican city of Puebla is trying a bright pink experiment in a culture famous for its machismo and violence. In an effort to prevent violent crimes against women passengers, 35 new taxis are driving the streets. These pink cars are driven by women and will pick up only female passengers. Inside, each pink taxi comes with a beauty kit, a GPS system and an alarm button. We talk to Eduardo Del Castillo, CEO of Pink Taxi, along with Elena Alvarez, a recent passenger.

For a look inside the Pink Taxi, watch the video below:

Last week, a horrifying cell phone video put the Chicago Public School system under a national spotlight. It captured dozens of teenagers in a street brawl using wooden beams as weapons. An innocent boy named Darrien Albert was brutally beaten to death. He is one of five teenagers who have been killed in Chicago this school year.

This morning, Attorney General Eric Holder and Education Secretary Arne Duncan will be having breakfast with Mayor Daley of Chicago to discuss the high levels of youth violence in the city. Linda Lutton, a reporter with WBEZ Chicago Public Radio, talks with us about school violence in Chicago.