Jack Charles O’hollaren, 20, disappeared from Florence, Oregon, after a beach party on the evening of April 15, 2016. Witnesses reported he removed his clothing and entered the Pacific Ocean near the north jetty of the Siuslaw River, swimming about 40 yards from shore into 54-degree water. He was seen go into the water but never returned.

Local agencies launched an extensive search that included Siuslaw Valley Fire and Rescue, the Lane County Sheriff’s Department, and the U.S. Coast Guard, but no trace of Jack was found. He was a sophomore at the University of Oregon and described by family as charismatic and adventurous, with interests in dirt biking, skiing, and entrepreneurship. His family held a Mass at St. Mary’s Cathedral in Portland.

What information might help clarify Jack’s last movements that night or explain why he didn’t make it back to shore?