“What happened to Nelson Mandela, what happened to Jesus? (They were) innocent,” Mr Glynn told the Post.
“I want to be a leader and all that. A lot of people are jealous, you know.”
Mr Glynn was arrested in January, days after a masked gunman burst into a Burger King on 116th St, East Harlem, and shot dead 19-year-old Kristal Bayron-Nieves.
The NYPD said a suspect bashed two people, including the 59-year-old restaurant manager, over the head with a pistol before demanding cash.
Bayron-Nieves, who had only started working night shifts three weeks earlier, handed over $100 from one register. She was attempting to open a second register when she was shot in the chest, police said.
Police used surveillance footage to trace the gunman as he fled on the subway to Bedford-Stuyvesant, Brooklyn.
Footage also showed the suspect making a card purchase in a bodega about an hour before the shooting.
Police arrested Mr Glynn a few days later at a flat in the neighbourhood, and allegedly found clothes belonging to the shooter in a nearby dumpster.
He had previously worked at the Burger King where the robbery occurred. He was charged with first-degree murder and other charges.
Bayron-Nieves’ grieving family told The Post they were sure Mr Glynn was responsible for her death.
“There is so much evidence against him,” her mother Kristie Nieves told the Post.