Greenfield was last seen during the early morning hours of March 18, 2018. Friends picked him up at his mother's residence in Oregon and drove him to the Lucky 7 Casino in Smith River, California. He was a regular there. He went into the casino at 1:00 a.m. and left At 1:50 a.m. with an adult male. They walked south across the parking lot near Highway 101. Eighteen minutes later, the man was seen on security footage returning alone to the casino, but Greenfield was nowhere to be seen. Authorities identified the male last seen with Greenfield in the security footage and questioned him. The man, whose identity has not been publicly released, stated he and Greenfield parted ways after leaving the casino. Greenfield's cellular phone was WiFi only and had no data, there's been no electronic trace of it since it disconnected from the casino's WiFi. He didn't drive or own a car. Foul play is suspected in his disappearance.