George Zimmerman's trial resumed on Tuesday. Zimmerman is charged with the 2012 murder of 17-year-old Trayvon Martin, an unarmed teen he shot and killed.

Those who wish to view Day 7 of the court session can watch it via free live stream below on a computer, tablet or mobile phone.

The lead investigator in the case, Chris Serino, is on the witness stand again today, after he was cross-examined for the first time on Monday.

Serino said today, he believes Zimmerman was telling the truth, during police interviews, about the day he killed Martin on Feb. 26, 2012, according to HLNTV's live update blog.

Defense attorney Mark O'Mara played Serino's Feb. 29, 2012 interview with Zimmerman, and Serino played the 911 non-emergency call Zimmerman made in the moments before he shot Martin.

Serino testified today that he told Zimmerman that he could hear the 911 operator tell him not to follow Martin.

After O'Mara finished his cross-examination with Serino this morning, prosecutor Bernie de la Rionda asked Serino about Zimmerman's emergency calls and interviews with police. De la Rionda played another portion of the Feb. 29, 2012 recording of Zimmerman's interview with police, in which Zimmerman mentioned that he started a neighborhood security program because his wife saw someone's home getting broken into.

"They told me not to follow him. I wasn't following him, I was just going in the same direction," Zimmerman said in the recording.

De la Rionda also asked Serino if there was any evidence that Martin was armed and whether Zimmerman's assumtion that Martin was carrying a gun could be considered profiling.

Zimmerman is facing second-degree murder charges in the trial, which began on June 24. When Zimmerman wasn't initially arrested, it sparked protests around the country. The chief of Sanford's police department resigned amid the backlash. Zimmerman was eventually arrested and charged 44 days after the shooting on April 11, 2012.

Zimmerman told police he shot Martin in self-defense, citing Florida's "Stand Your Ground" law.

"Stand Your Ground", which was legalized in 2005, states that a person may use deadly force in self- defense without the duty to retreat when faced with a reasonably perceived threat. The law is practiced in almost 30 states.

Watch the free live stream of George Zimmerman's second-degree murder trial below.

Tags
George Zimmerman Trial