TAMPA, Fla. — A man already serving a prison sentence for an unrelated crime was charged Tuesday with manslaugther in connection with the death of a popular Bay area muralist.

• Muralist Matt Callahan died in April 2018
• Altercation between Callahan, Keith Mauga happened at a Tampa bar
• Callahan's father an attorney, vigorously pursued justice for his son

Tampa Police said Keith Mauga punched muralist Matt Callahan at a South Tampa Bar back in April. Callahan reportedly fell to the ground and hit his head. He later died.

For months, police investigated the death. Callahan’s father, Michael, an attorney also started looking into Matt's death.

Michael said he wasn’t going to rest until justice was served. He made a flyer warning Mauga charges were coming. He also offered a reward.

“I think from the very beginning it was pretty well known that the person who did this was Keith Mauga,” Michael said. “The only question was 'Who saw it, who knows the details?'" 

"As the investigation progressed it turns out Mr. Mauga admitted that he did it to another person and at least two other people who were an eye witness to what he did,” he continued.

Michael said like any other parent he’s heartbroken about his son’s death, but this arrest is a bit of a relief.

“I think it’s very, very important for any family member of a child whose been murdered to see that justice is done, and it takes a load off your brain and your mind," he explained. "At the same time, it’s important to the public that people like him are not on the street."

Mauga is currently serving five years in prison for a different violent crime. 

Though he plans to see this case through, Michael told us he also wants people to remember his son for the loving father, husband and son that he was.

“[Matt] was an extraordinary artist. He was known around the country, He did a lot of work for Disney in both California and Florida. He has murals all over the Tampa Bay Area,” he said. “Art is important in society. That when people see good art it affects them emotionally in a way that makes them better people, and he was one of those people.”

Michael said there’s an art show planned in his son’s honor at Copper Tail Brewing Company on Oct. 1. He said their family also received $30,000 in donations to create a scholarship in his son’s name for young high school students.