Jon Seda

The detective soared as the Intelligence Unit's cherished second-in-command from Season 1 until Season 6. 

The One Chicago alum looked overjoyed to share the moment with his former co-stars. 

Antonio Dawson, played by Jon Seda, had a harrowing arc on Chicago P.D.

The third season of La Brea just introduced a major twist that could change everything.

Go back to the distant past, and then else...when, whenever you like.

Law & Order: SVU and Chicago P.D. joined forces for an epic 2015 crossover event to track down a serial killer based on Ted Bundy.

The La Brea actor and former Chicago P.D. star's son Jon Seda, Jr. was a guest star on the sci fi series.

Crossovers don't just happen on screen when it comes to Chicago Fire, Chicago Med, and Chicago P.D.

Dora Madison Burge played both paramedic Chili and her identical twin, Jellybean, in two tragic storylines.

From Gabriela Dawson dealing with her dad's stabbing to the death of Kelly Severide's dad, get ready to cry.

Jon Seda, who played a cop in the One Chicago franchise, has a new life as Dr. Samuel Velez on La Brea.

Turns out he's a little busy time-traveling to 10,000 B.C.