Adam Lanza, 20, reportedly opened fire at Sandy Hook Elementary School in Newtown, killing 20 kindergarten students before allegedly turning the gun on himself.
The shocking massacre has prompted movie bosses to call off the Saturday night (15Dec12) film premiere in Pittsburgh, where the majority of the blockbuster was shot.
A statement issued by Paramount Pictures executives on Friday reads, "Due to the terrible tragedy in Newtown, Connecticut, and out of honour and respect for the families of the victims whose lives were senselessly taken, we are postponing tomorrow's Pittsburgh premiere of Jack Reacher. Our hearts go out to all those who lost loved ones."
Meanwhile, network chiefs at the Syfy channel pulled their planned Friday episode of supernatural drama Haven due to its violent content.
A spokesperson for Syfy told TheWrap.com, "(The) scheduled 10 p.m. episode of Haven contained scenes of fictitious violence in a high school. In light of today's tragedy in Newtown, Connecticut, we have decided not to air it."
A total of 28 people were killed in the shooting rampage, including Lanza's own mother, who was a teacher at the school.