Miami police on Friday arrested a homeless suspect they say fatally sucker-punched a Boca Raton man after asking him for a cigarette.

Sosthene Louis, 35, was charged with second-degree murder in the Monday killing of Lisney Oliveira Jr., who died when his head struck the sidewalk after being punched, police said.

Louis was arrested in the 9300 block of Northwest 27th Avenue in Miami. A tipster recognized him from surveillance video blasted in media reports and called police, said Miami Officer Jeffrey Giordano.

“It was a sad start, but at least it’s a positive ending,” he said.

The attack happened as Oliveira, 26, walked with a friend to the club Mekka near Northeast Second Avenue and Ninth Street about 5:30 a.m., police said.

Louis asked the pair for a cigarette, but the friend, whom police didn’t name, said they didn’t have one and kept walking. At that point, Louis punched Oliveira in the back of the head, knocking him to the ground, police said. Oliveira died at Jackson Memorial Hospital shortly after the attack.

“Nothing will bring him back, but at least I know that man wouldn’t do that to someone else,” the victim’s mother, Heloisa Oliveira, said.

Her son was outgoing and never started trouble with anyone, she said.

But in February, Fort Lauderdale police charged Oliveira with sexual battery, possession of marijuana and drug paraphernalia after finding him in a secluded section of a parking garage in the 300 block of South Andrews Avenue.

There, at about 2:45 a.m. on Feb. 15, according to a police report, he was sexually battering a woman who was passed out in the back seat of a car. When police woke up the victim, she told police she did not know Oliveira or how she got to the car.

Lisney Oliveira Jr. moved from southern Brazil to South Florida more than 11 years ago, said his family.

He loved to go dancing and have fun and often didn’t return home until after sunrise, said his father, Lisney Oliveira Sr.

Lisney Oliveira Jr. worked as a debt consultant and modeled on the side. He also was an aspiring photographer, according to his family. He was the oldest of three siblings. His sister, Paula Oliveira, 21, said his happiness was contagious.

“He taught us how to live life,” she said.

Staff Writer Jerome Burdi contributed to this report.