The murder trial of a Utah doctor accused of killing his ex-wife in 2011 amid a bitter custody dispute is entering its second day with testimony from a blood spatter expert.

Prosecutors say blood found throughout the Salt Lake City home of 49-year-old Uta von Schwedler shows she was murdered. They say her ex-husband, John Brickman Wall, was the only one who could have killed her.

But lawyers for the 51-year-old pediatrician say his ex-wife could have cut herself and stumbled around the house before she died in her bathtub.

A medical examiner found von Schwedler died from drowning and a fatal amount of the anti-anxiety drug Xanax, but stopped short of ruling her death a homicide or suicide.

The cancer researcher also had cuts on her wrist and leg.