LARGO, Fla. -- A teacher who killed his ex-wife, her alleged female lover and their two children told others that he would commit the murders if he could not have his family back, investigators said Saturday. Meanwhile, a family Web page said they were going through "major changes."

Investigators believe Oliver Thomas Bernsdorff, 36, fatally shot himself Friday when state troopers tried to stop his van, which was driving erratically.

Authorities will use DNA testing to confirm Bernsdorff's identity, police said.

"Our detectives spoke with persons, during the course of their investigation, who told them that Mr. Bernsdorff had made statements to the effect of ...if he could not have his family back the way they used to be, he would kill them and his self," Loux said.

Police said Bernsdorff fatally shot and killed his ex-wife and another woman inside a first-floor apartment in Largo. Police found the victims after receiving reports from neighbors that they heard gunshots around 6:42 a.m. The victims were identified as Bernsdorff's ex-wife, Jennifer Davis, 27, and Andrea Pisanello, 53.

Authorities believe the women "lived together as a couple and were involved in a relationship," Lt. Mike Loux said in a statement.

Later that morning, investigators found the bodies of Oliviana Bernsdorff, 4, and Magnus Bernsdorff, 2, in Bernsdorff's Clearwater home, Clearwater police said. The cause of death hasn't been released.

Florida Highway Patrol said they discovered Bernsdorff's car in the mangroves off the Sunshine Skyway bridge around 10:30 a.m. Friday.

In August, Bernsdorff filed for divorce from his wife. The divorce settlement required Davis to pay about $800 per month in child support, but as of October, she had not paid any and was $1,851 in arrears, according to court records obtained by The Tampa Tribune and St. Petersburg Times.

The divorce records show Bernsdorff was in debt, including $135,000 in student loans, $27,000 owed to the IRS, a $33,000 private loan and roughly $50,000 in credit card debt, the papers reported.

The Bernsdorff family and Pisanello had all been members of the Unitarian Universalist church in Clearwater. A statement issued by church leaders said "the congregation is in shock, grief and mourning" over the deaths.

Web Page Shows Photos, Says Stay Tuned

On Bernsdorff's Web page, which was last updated on May 6, a note reads: "Our family is going through major changes right now, please stay tuned."

Pictures of Bernsdorff's children, Olivia Johanna (Olivianna), 4, and Magnus Arwyn, who would have turned 3 in February, appear on the page.

The page said that Bernsdorff is a GED teacher at St. Petersburg College in Clearwater, and an occasional adjunct instructor in the college of education at the University of South Florida, St. Petersburg. He is also a doctoral candidate at USF completing his dissertation toward a Ph.D. in Interdisciplinary Education.