Over the past 8 months his parents have been putting out flyers and Bassman stickers all over town.
They hope someone sees the surveillance video of a man ducking between cars and running around Eastern Avenue and speaks up.
That video was shot right around the same time Sebastian was found bleeding in the street just a few streets over.
His father David Dvorak said his son was gregarious and fun loving.
"He was the kind of guy who would light up a room and everyone enjoyed being around,” said Dvorak. “He made everyone feel better about themselves. He was a great conversationalist and he just loved life. We miss him a great deal."
His mother Lisa Richards said her son loved the city of Baltimore.
"I guess the charm of it, it's not a joke that its Charm City,” Richards said. “He loved that it was unassuming. You could be in Baltimore and it really didn't matter what you did or what you accomplished you were someone that everyone wanted to get to know and welcome into the community."
His parents are calling on the people of this city, the ones who know what happened to their son
“Somebody knows what's going on, and I understand that in Baltimore it's scary to give information,” said Richards. “We've seen time and again people have been killed for providing information to police about what they knew. We have to have the courage to do that or it will never change."
T.J. Smith the Chief of Media Relations of Baltimore Police Department said the man seen ducking and running between cars is one of two persons of interest.
"People see this and they might have forgotten about the case,” said Smith. “It might help them remember something. It might help whoever these people are who are persons of interest come forward and tell us why they were in the area at that time."
His parents cling to hope and will keep spreading their Bassman stickers throughout the city.
"When we talk about it we'll hear people say to us oh they caught those guys. Not realizing we're the parents, putting up the posters. There's so many similar crimes happening in Baltimore that folks can't even keep it straight. Who’s been arrested, whose got justice who hasn't and that's heartbreaking for us,"
Metro crime stoppers is offering a reward of over $2,000 for any information that leads to an arrest.
Anyone with information is asked to call Homicide detectives at 410-396-2100, Metro Crime Stoppers at 1-866-7lockup or text a tip to 443-902-4824.