fanfiction-danny phantom: A Successful Sacrifice by Atiya_Blackcharm

Summary:
“Tim…He liked to be called Tim,” his son said except that wasn’t his son’s smile.

That wasn’t Bruce’s son at all.

The puddle of blood was too big. Tim’s skin was concerningly pale even in dim lighting. The blood on his hands looked dry. The side of his uniform was darker than it should have been. The sigil on the ground hummed with power, not letting anyone pass even after those who drew it and chanted had been dealt with.

The summoning was still in effect.

His son was dead.

tldr; Tim as Red Robin was killed when being sacrificed to summon Danny who was forced into his body.