RENO, Nev. (AP) — A missing Oregon woman was found shot to death in Nevada, but her two daughters remained missing, police said Tuesday.

The body of 21-year-old Kimyala Henson was found near Wadsworth, about 60 miles northeast of Reno, on April 29, according to the Washoe County sheriff's office. A couple she had traveled with were found dead in Florida and were suspected in the killing, police said Tuesday.

"We don't have a motive at this point," Washoe County Sheriff Dennis Balaam said. "Everybody that really has any information as far as our investigation goes is dead."

Police said the couple's deaths were a murder-suicide.

Balaam said authorities searched 100 square miles around the area where Henson's body was discovered but found no trace of 4-month-old Shausa Henson or 2-year-old Shaina Ashly Kirkpatrick.

Henson and her daughters set out April 4 with Christina Mayer, 24, and her boyfriend, Frank Oehring, 28. The two were found dead April 20 at a highway rest area near Naples, Fla.

Florida authorities said Oehring, a Missouri fugitive wanted on a charge of conspiracy to commit murder in the attempted strangulation of his ex-wife, shot Mayer with a .22-caliber rifle and then turned it on himself.

Florida law enforcement officials found Henson's wallet and credit cards in a car parked at the rest area and traced the transactions. Investigators suspect they were fraudulently signed by Mayer.

Before she left Oregon, Henson told her family she planned to travel with the couple to Alameda, Calif., to get a copy of her birth certificate before heading north for a two-week trip in Canada.

Investigators said that someone picked up a copy of Henson's birth certificate in California. A copy of the certificate, ripped in half, was found in a trash can at the Florida rest area.

On April 6, two of Henson's Visa cards were used in Nevada and then continuously used for gas and food purchases during a trip east.

Investigators determined that Mayer and Oehring had traveled to Florida through Nevada, Utah, Colorado, New Mexico, Texas, Louisiana and Mississippi.