A Lacombe woman who had just reported that she feared an ex-boyfriend had followed her home was shot to death Sunday night in a suspected murder-suicide that capped off a violent weekend in St. Tammany Parish, according to the Sheriff's Office.

Her death followed that of 25-year-old Jarred Kirsch, who was fatally shot in an unrelated incident Friday in Lacombe in which four other people were injured. That case remains under investigation, with no new details released Monday by the Sheriff's Office.

The woman who was killed Sunday was identified by the Coroner's Office as Krystle Landor. She had just called 911 to report that the ex-boyfriend, against whom she had a protective order, was a passenger in a pickup that had followed her to her home on East Elm Street, according to a St. Tammany Parish Sheriff's Office news release.

Moments later, dispatchers received another call from someone at the scene who reported that the 28-year-old woman had been shot. She was taken to a hospital, where she died.

A patrol deputy then spotted the pickup heading eastbound on U.S. 190 near Thompson Road and attempted to stop it. But the truck drove away, leading deputies on a chase that ended on Garrett’s Prime Run in Pearl River.

Deputies detained the driver, Leslie Davis, but the passenger, John Malveaux fled on foot, entered a residence and shot himself, the Sheriff's Office said. Malveaux, 36, of Slidell, was later pronounced dead by medical personnel.

Davis, 55, was booked on a count of being a principal to first-degree murder, the Sheriff's Office said.

Landor had sought the protective order against Malveaux on Oct. 16, according to court records. It was due to expire Nov. 16, and a court hearing on the matter had been scheduled for Friday of last week.

The court filings listed Malveaux's address as the Beacon Behavioral Hospital in New Orleans. But the Sheriff's Office listed an address on Drury Lane in Slidell.

Malveaux had a lengthy criminal history, beginning in 1999, and pleaded guilty to felony counts of distribution of narcotics, simple robbery, attempted purse snatching and attempted simple burglaries. The most recent entry on his record was a misdemeanor charge of resisting arrest in 2010.

Davis also has a record, including a 2002 guilty plea to a felony count of distributing a controlled dangerous substance within 1,000 feet of a school.

Also Sunday, about 7:30 p.m., a man reported he was shot multiple times outside a home at 57964 Jefferson Ave. in Slidell, the Sheriff's Office said. He is being treated at a south shore hospital. No suspects have been identified in the case, which remains under investigation.

"This was a tragic and violent weekend in St. Tammany,” Sheriff Randy Smith said. “Our investigators will continue to work all of these cases until they are solved.”

The Sheriff's Office asked anyone with information on any of the incidents to call 911 in St. Tammany Parish or (985) 898-2338 or Crimestoppers at (504) 822-1111.

Follow Sara Pagones on Twitter, @spagonesadvocat.