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, and then himself as the siblings arrived home. The Sadowski family released a statement on GoFundMe describing how Tyler “stepped in to protect his sister” in what they are calling a “heroic act of love,” per the online fundraiser.

“In doing so, he lost his life,” the description says. “Makayla, seven months pregnant at the time, was shot in the stomach. She is now in the hospital fighting for her life, while her baby boy also fights for his. At home, she has a 2 year old toddler who needs her love and care, and our family is doing everything we can to hold her up through this nightmare.”

Shanay Conyers, a cousin to the siblings, told local NBC affiliate KARE that they “came home from town and Makayla walked inside the house and they heard like a pop, so Tyler went to go see what was happening.” He was allegedly shot by Makayla’s boyfriend soon after.

Tyler and Makayla’s mom, meanwhile, was in a car outside with the teen’s 2-year-old child.

“Our family is doing everything we can to hold her [the child] up through this nightmare,” the GoFundMe description says.

Speaking to KARE, Conyers condemned the SnapChat video that was allegedly taken of the double shooting, saying it shows the depravity behind what happened.

“That’s gotta tell you something right there,” she said. “If you post something like that, you definitely are a violent person.”

The Turtle Lake School District reportedly sent a warning to parents last week that the alleged video may have been received and viewed by students.

“We have heard that the shooter … was a former student of Turtle Lake School years ago,” the district said in a statement. “He apparently shared a graphic video of the shooting on Snapchat, where some Turtle Lake students could have received the message and could be upset. Please talk to your children tonight about this incident. Our counselor will be available tomorrow to discuss any needs your child may have.”

The Barron Area School District also sent out an email, saying: “We were also informed by the Barron County Sheriff’s Department that the suspect involved in today’s incident recorded and distributed a video via Snapchat, showing the aftermath. This video is reportedly spreading rapidly across social media platforms. We are sharing this information so that parents and guardians are aware, as some students may have access to the content through their personal devices at home.”

Makayla’s boyfriend is still being treated for his self-inflicted injuries at a local medical facility and is expected to be charged once he’s released, cops say. Makayla has undergone multiple surgeries and her baby is in stable condition after being delivered by doctors.