Farrall said detectives still do not know how Wheeler got to Newark or ended up in the trash bin.
"We're still attempting to determine how he made his way to Newark and who is responsible for his murder," Farrall said. "How he got the injuries, I just don't know."
Wheeler's family has offered a $25,000 reward for information about his death. The general public seems baffled about the Wheeler case, and so are those who were closest to the victim.
The announcement of the reward came Sunday through lawyer Colm F. Connolly, a former U.S. attorney for Delaware, whom the family hired to represent them and act as a go-between with law enforcement.
Connolly said Wheeler's death is as much a mystery to the family as it is to the public. He said Wheeler's family is despondent over his death and "desperate" for information.
One of Wheeler's closest friends has a theory about what happened:
Retired Army Col. Doug Thormblom, a former roommate of Wheeler's at West Point, said the autopsy results indicate his old friend was a victim of a mugging gone awry but that many unanswered questions remain--such as why he was so disoriented in the days before he was killed, whether any drugs or chemical agents were in his system and how he got from Wilmington to Newark, about 13 miles away.
"I'm glad there was no direct poisoning that caused his death, but his disorientation still hasn't been explained," said Thormblom, who thinks Wheeler suffered a stroke or some other kind of physical or mental breakdown.