Jacqueline Avant's Killer Bragged After Shooting, Says Prosecutor

Aariel Maynor, the man that shot and killed Jacqueline Avant, bragged to his friends over the phone from jail after murdering the 81-year-old philanthropist ... this according to the prosecutor seeking to lock him up for the rest of his life.

According to court documents, obtained by the Los Angeles Times, Maynor laughed about all the publicity he's been getting to a friend during a jail call ... she didn't think it was funny, telling him he shouldn't be joking about someone's life. He told her it was all over the news, wondering "You think my mama's seen that, though?"

He told her he expected to get $50K from the Avant's house before the robbery went south.

He reportedly called another friend from jail and told them he expected to only serve a max of 25 years because the prosecutors did not file a so-called "special circumstances" murder charge -- which could've resulted in life without parole, or even the death penalty.

As we reported, Maynor broke into the Avants' Beverly Hills home in December, opening fire on Jacqueline with his assault long barrel pistol. She was taken to a hospital but died of her injuries.

Police caught Maynor an hour later ... after he was found attempting to burglarize another home in the Hollywood Hills but accidentally shot himself in the foot.