Cyborg seemingly kills Silas, before Mr. Nobody appears to taunt him over murdering his father for no reason. However, in "Flex Patrol", it was revealed that Silas is still alive and in critical condition.

Does cyborgs dad come back?

Silas Stone is a scientist who formerly worked at S.T.A.R. Labs and is the father of Victor Stone. ... While on his deathbed after years of failing to make it up to his son due to him dying from radiation poisoning caused by a monster the Teen Titans were fighting, Silas finally reconciled with Cyborg as he passes away.

What happened to cyborgs parents?

Pre-Teen Titans

Cyborg was a promising strong teenage athlete named Victor Stone, before an accident killed his mother and injured him so severely that his father replaced the damaged body parts with cybernetics to keep his son alive.