SPOKANE VALLEY, Wash. -

The Spokane County Sheriff's Office is investigating the death of a toddler who died unexpectedly Thursday afternoon.

911 received a call from a home at 3205 S. University at 1 p.m. Thursday where a three-and-a-half-year-old boy died unexpectedly. The toddler had no known medical history.

Deputies are investigating because they don't have an obvious cause of death. At this time they won't say the toddler's death is suspicious.