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Joshua Luke Moffitt, DMD, show here during work for the Tooth Taxi in Terrebonne, Oregon in October 2012, shot and killed himself Monday at his Southeast Portland home. Moffitt was under investigation by Portland police for multiple sexual assaults involving two victims who are now adults but were juveniles at the time of the incidents, officials said.

(Thomas Boyd/The Oregonian)

Joshua Luke Moffitt

Dentist Joshua Luke Moffitt worked for the Tooth Taxi, a nonprofit that has provided dental screening to thousands of low-income children.



He also was a suspect in sexual assaults against two children, Portland police say.



Some time before authorities arrived on Monday to serve a search warrant at his home in the 1400 block of Southeast 46th Avenue, the 35-year-old Moffitt apparently shot himself to death.



Sgt. Pete Simpson said members of Portland Police Bureau's Special Emergency Response Team discovered Moffitt's body around 7 a.m. Simpson said Moffitt was aware he was under investigation, and the tactical unit was sent out of concern that the man had firearms and was suicidal.





The Tooth Taxi.

Moffitt was under investigation in connection with multiple sexual assaults of two youths who are now adults. Police did not say when or where the two were allegedly assaulted. However, police said the alleged assaults happened outside Moffitt's work as a dentist.

Investigators are working to follow up with “any information leading to additional victims,” the police bureau said in a news release.

Tooth Taxi, a 38-foot-long rolling dental clinic, is a partnership between the Dental Foundation of Oregon (the charitable arm of the Oregon Dental Association), OEA Choice Trust and Oregon Dental Service, now called

.

Since September 2008, the Tooth Taxi has visited 218 sites in Oregon and staff and volunteers have screened more than 13,000 students. The project has provided more than $3.5 million in dental services, according to the dental foundation's website.

"It is our policy that no adult is ever left alone with a child," said Katie Paullin, a spokeswoman for ODS.

Paullin said Moffitt joined the staff of the Dental Foundation of Oregon in July 2012 and was a paid dentist working for the Tooth Taxi.

Tooth Taxi and Dental Foundation of Oregon officials are cooperating with the investigation, Paullin said.

According to the

, Moffitt received his dentist's license in July 2004 and has never faced disciplinary action or malpractice lawsuits.

Board records show that at the time Moffitt received his license, the dentist listed his business address as the Kaiser Permanente Skyline Dental Office in Salem.

Simpson said detectives learned that Moffitt had lived and worked in the Browning, Mont., area in the late 2000s and may have performed dental work on children at nearby Native American reservations.

According to its

Browning is a community on the Blackfeet Indian Reservation, which includes most of Glacier County and is home to about 8,600 members of the Blackfeet Nation, the largest tribe in Montana.

Portland police are asking anyone with information about the case to call detectives at 503-823-0400.

--Stuart Tomlinson