Thursday marked the last day of the active police search for missing University of St. Thomas student Dan Zamlen, according to the Star Tribune. Zamlen, 18, disappeared early last Sunday after leaving a party. He apparently was seen drinking and left upset. If Zamlen is still alive, he would have turned 19 Wednesday. Searchers expressed worry that with the cold weather, the reported drinking, and ZamlenâÄôs Type I diabetes, his insulin pump would only run so long before he could slip into a coma, according to the Star Tribune report. Police also expressed doubt about the existence of an alleged phone call made by Zamlen to a friend after his initial disappearance. There were no signs of foul play. Despite the end of the St. Paul policeâÄôs search, ZamlenâÄôs family and friends vowed to continue searching for Dan.