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Robert Michael O'Hare Jr. (May 6, 1952 – September 28, 2012) was an American actor who performed on stage and television. He was best known for playing Commander Jeffrey Sinclair in the science fiction television series Babylon 5, a role he left due to serious mental health issues. Born in Chicago, Illinois. He attended Chicago's Mendel Catholic Preparatory High School, then studied at Harvard University, where he majored in English literature. He studied at the Juilliard School of Drama, and with Sanford Meisner.

Babylon 5: In the Beginning
as Lt. Cmdr. Jeffrey Sinclair (archive footage)

Babylon 5
as Ambassador Jeffrey Sinclair

Babylon 5: The Gathering
as Cmdr. Jeffrey Sinclair

By a Thread
as Quentin Springer

Law & Order
as Roy Lawlor

The Ambulance
as Hal

Last Exit to Brooklyn
as Riot Police Officer
Short-Term Bonds
as Bowers

L.A. Law
as Michael Lattimer
A Case of Deadly Force
as Joe Miller

The Equalizer
as Alex

Tales from the Darkside
as Jimmy

C.H.U.D.
as Fuller

Kate & Allie

T. J. Hooker
as Cal Jastrow

The Pursuit of D.B. Cooper
as Car Owner

Fly Away Home

Marciano
as Allie Columbo

Trapper John, M.D.

The Promise
as Ben Avery

Keefer
as Benny

The Adams Chronicles
as Richard Cranch