A Missouri father-to-be allegedly gunned down the mother of his unborn child after getting “upset” over a message he received on Facebook, which asked him to stay away from her just five hours before the fatal shooting, cops say.

Sidney Wilson V, 25, of Stoutland, was charging his 2022 Tesla Model 3 at Wally”s convenience store in Fenton when he received the message that allegedly set him off on June 5 before he killed 21-year-old Reagan Wilson — his pregnant estranged wife — at her home in Lebanon, according to police officials. The child, who was to be named Silas, survived the attack but died eight days days later on June 13.

“Didn’t want him or his family there,” Wilson’s probable cause statement says about the message he received. “When asked if the message upset him, he said that it did, and he waited a while to respond back,” cops allege.

Wilson faces charges of first-degree murder and armed criminal action. He was scheduled to be arraigned Monday and is being held without bond at the Laclede County Jail.

Lebanon police officers were responding to a report of a shooting at 11:37 p.m. in the 700 block of North Adams Avenue when they found Reagan Wilson dying inside the residence. Paramedics rushed Reagan to a local medical facility and delivered Silas, cops say.

Sidney Wilson allegedly shot her, fled the residence and then went to the hospital where Silas was being treated in the days that followed before his eventual death.

“Never once asked about the status of the investigation and where we were on locating a suspect in the investigation,” the probable cause statement says about Wilson. “He only asked about when he could get his vehicle back.”

Relatives tell the local media outlet Ozarks First that Wilson was Reagan’s husband and they were separated. Wilson allegedly admitted to cops that their relationship was “strained after she left him in December 2024,” the probable cause statement says.

Redacted statements made to police by Wilson include one where he mentioned “that it would be easier if [name redacted] was dead,” according to the probable cause statement. He also confessed to owning a gun that matched the one used to kill Reagan, but claimed he “sold it to an unknown individual” who randomly approached him in April “while he was eating” out in public, police say.

“They had a conversation for a couple of hours and then he made the decision to sell him his gun,” Wilson allegedly told cops about the interaction. Video footage obtained by police on dates provided by Wilson show him ordering his food and leaving without speaking to anyone, the probable cause statement says.

“He never sits down and never communicates with anyone other than the employees,” police allege.

Reagan’s family tells Ozarks First it’s a “sigh of relief” to have Wilson behind bars and “long overdue,” according to Ozarks First. “Our almost-adult kids are struggling and terrified to go outside at night,” said Sarah Ice, Reagan’s mother. “Their sister was just taken, for no reason,” she told the local outlet.

“We’re very thankful we can start getting some closure from this point on,” said Reagan’s stepfather, Jeff Ice.