JACKSONVILLE, Fla. — On Thursday, officers with the Jacksonville Sherriff’s Office arrested 35-year-old Mark Mulliens for his alleged involvement in the May murder of 28-year-old Jarrius Brown.
According to JSO, on May 17, officers responded to a shooting at a home on Mayfair Road, near Beach Boulevard. At the scene, officers found Brown suffering from an apparent gunshot wound. He was then rushed to a local hospital, where he died of his injuries.
This story continues below.
JSO said its investigation revealed Brown was in a fight with Mulliens, which escalated and led to Mulliens shooting Brown.
Detectives arrested Mulliens 10 days after the shooting, for possession of a firearm by a convicted felon, while building the murder case against him. He had been in the Duval County Jail on that charge since May, but now additionally faces second-degree murder.
Records show that Mulliens was released from prison in 2025, after he served four prison sentences for drug trafficking and armed robbery convictions.
“The fight for justice doesn’t stop here; we’ll continue to work to bring closure to Brown’s loved ones,” JSO officials said in a statement.