MILLCREEK, Utah — Police are continuing to investigate whether a Utah driver’s medical issue was responsible for sending a pickup truck careening into a Starbucks patio last week.

The Deseret News reports that Salt Lake County Sheriff Rosie Rivera can’t confirm investigators’ initial hypothesis about a medical episode such as a seizure until she reviews a toxicology report that is still being compiled.

One woman was killed and three others were injured when the pickup truck went off a road, over a curb and onto the Starbucks patio

in suburban Salt Lake City on Friday.

The driver has been identified as 34-year-old West Walker.

Rivera says he not yet provided a statement to police. Authorities have said there’s a chance he may face charges.

Walker’s two small children were inside the truck during the crash and sustained minor injuries.