A sheriff's deputy began hauling a handcuffed Munoz off, even as he spoke to Collins-McCowen's mother.
"I didn't do it," he told her.
A woman with Collins-McCowen's mother yelled at Munoz, urging him not to speak to her.
As she began exiting the courtroom, she exchanged words with Munoz's family.
Collins-McCowen's mother declined to make a statement in court about the case.
Her daughter was found shot to death about 8 p.m. April 3, 2008, outside a bowling alley on Venice Boulevard in Los Angeles.
After killing his girlfriend at the bowling alley, Munoz drove to the cemetery, where his father and grandfather were buried, police said.
Soon after, Glassell Park residents called police reporting hearing a gunshot on the cemetery grounds on South Glendale Avenue.
Forest Lawn security then called Glendale police reporting a suspicious car parked on the cemetery lawn.
When officers arrived at the cemetery, they were met with gunfire.
Glendale Police Officers Justin and John Darby, who are brothers, and Kelley Cook and Kyle Heinbechner then radioed in that they had been fired at.
Police surrounded the cemetery, where Munoz, who doesn't have a criminal history, pointed a gun at a special weapons and tactics vehicle.
Munoz recorded his phone conversation with a friend during the standoff, in which he admitted to shooting his girlfriend three times, police said.
"Justice was served," Deputy Dist. Atty. Marguerite Rizzo said about the sentencing.
After several hours of negotiation with Munoz via his cell phone, he appeared to be giving up until he suddenly stepped on the accelerator of his car and charged a police barricade.
Officers fired shots at his Escalade, and it crashed into one of the patrol cars. Munoz survived a shot to his head.
