A jury heard explosive testimony on the third day of Eddie Ray Routh’s trial.

Routh is accused of killing “American Sniper” Chris Kyle and his friend Chad Littlefield at a shooting range in February 2013.

Today, a former sheriff's deputy testified that he heard Routh make a comment in jail in June 2013, though no one was talking to him or asking him questions.

Officer Gene Cole testified that Routh said, “I shot them because they wouldn’t talk to me. I was just riding in the back seat of the truck and nobody would talk to me. They were just taking me to the range so I shot them. I feel bad about it but they just wouldn’t talk to me. I’m sure they forgive me.”

Cole said he remembers the quote because he filled out a report immediately after hearing it.

This testimony is the closest that the prosecution has come to presenting a motive in this case.

Routh’s uncle also took the stand today, testifying that he smoked marijuana with Routh the morning of the shooting. He said that later in the day, Routh pulled up in Kyle’s vehicle and said, “I’m driving a dead man’s truck.”

A detective said he found drug paraphernalia and an anti-psychotic drug in Routh’s name in the alleged killer’s home.

A week before the shooting, Routh was diagnosed at a mental institution as being potentially harmful to others, but was released with medication.