A young Wisconsin man was shot dead while attempting to "protect" his pregnant teen sister from her killer boyfriend, who blasted her in the stomach and then posted footage of the shooting on SnapChat , according to police.

The "disturbing SnapChat video" was allegedly shared online after Wednesday's gun attack on Tyler Sadowski, 20, and Makayla Sadowski, 17, and possibly viewed by students at a local high school that the shooter, who has not been identified publicly by police, used to attend, according to the Barron County Sheriff's Department.

"We are aware … and are working with SnapChat to remove this video," the sheriff's department said in a Facebook post Wednesday after the shooting.

Makayla Sadowski's boyfriend is accused of shooting Tyler Sadowski dead, Makayla in the stomach,

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