Friends and family held a vigil to remember Michael Cassel, the man who they said died a hero.
Dozens of people surrounded the house where Cassel once lived with his wife and children on Charleston's West Side.
Charleston Police said Patrick Price shot Cassel to death inside his home on Red Oak Street before turning the gun on himself on February 10.
Charleston Police said revenge possibly motivated Price to murder Cassel.
Detectives told 13NEWS Cassel had reported Price to authorities for abusing his own daughter.
At the time of the shooting, police had been investigating the child abuse case.
"We came to celebrate his life," said Tonja Jesko, Cassel's mother-in-law. "Keep his light burning, keep that love going."
Jesko said she hopes Cassel's story teaches others to take action, speak the truth, and protect the innocent.
"If there is a child in need, if there's a child that's hungry, if there's a child being abused, do something," Jesko said.
Jesko said Child Protective Services has placed Price's daughter in a foster home.
Family laid Cassel to rest Monday. He leaves behind a wife and four children.