The two people found dead Tuesday in a White Bear Lake home likely died of natural causes more than a year ago, authorities said Wednesday.

Their identities have not been confirmed through the Ramsey County medical examiner's office, but a neighbor said that 93-year-old homeowner Evelyn Kuefler had been living there with her twin sons. One of the sons was Richard Kuefler, 59. His twin brother was arrested Tuesday for alleged financial exploitation of a vulnerable adult and told police that the two people found in the home died on separate occasions in 2015, according to police. He has not been charged; the Star Tribune generally does not name suspects who haven't been charged with a crime.

White Bear Lake police said in a news release Wednesday that the medical examiner's office was unable to determine the causes of death, but "believe it was of natural causes."

The son remains in custody pending the investigation, police said.

According to the news release: A resident in the 4700 block of Sandra Lane called police about 7:32 a.m. Tuesday requesting a welfare check at Kuefler's home, noting that there had been no activity there and that the lawn had become overgrown.

Neighbors told officers who responded that the homeowner lived there with her twin sons, and that one son's vehicle parked in the driveway hadn't moved in a week and a half.

"Upon further investigation, officers viewed a deceased person through a main floor window," the news release said. "They then made entry into the residence and discovered a second deceased person downstairs."

One son was home when police arrived, and was detained without incident.

Neighbor Robert Henk said the sons moved into the home after their father, Fenwick Kuefler, died in 2011. One of the sons was dependent on an oxygen tank and lived in the basement, Henk said.

Chao Xiong • 612-270-4708

Twitter: @ChaoStrib