Four years ago this coming Friday, someone walked into the Islamorada apartment of Henry Allwardt and fired several bullets into the 70-year-old security guard.
The 2010 homicide remains unsolved but the case remains open.
"At this point, there really are no new developments," Deputy Becky Herrin, information officer for the Monroe County Sheriff's Office, said Thursday.
Earlier this year, Sheriff's Office detectives returned to the Pirates Lair Road neighborhood, off mile marker 82.5, to speak with residents who live nearby.
"Somebody might have remembered or heard something they wanted to pass along," Herrin said. "There were no new results, but you just keep trying."
Given the relatively secluded nature of the area, Major Crimes Unit detectives believe Allwardt likely knew his killer.
A "person of interest" was identified soon after Allwardt's body was discovered Sept. 12, 2010. However, no physical or eyewitness evidence yet has linked that person to the crime.
"That's been the case since the beginning," Herrin said. "No new information has changed that status."
Allwardt's body was discovered around 6:20 p.m. Sept. 12, 2010, by his supervisor at The Moorings resort, where he worked.
The supervisor became worried that Allwardt did not show up for his shift and did not call in. Fearful that Allwardt suffered an attack from his diabetes, she went to his home and found his body.
A detective answering the supervisor's call described Allwardt as "lying on the floor parallel to his bed, between a small table and the bed."
He died of "died of multiple gunshot wounds," the Sheriff's Office reported. The type of weapon used has not been identified publicly.
"No one reported hearing or seeing anything suspicious," Herrin said.
Neighbors last saw Allwardt, who lived in a small caretaker's apartment at the waterfront residence, around noon on Sept. 11. His 2003 silver Honda sedan was parked outside when deputies arrived.
Allwardt emigrated from Germany about 25 years ago. He previously worked at other Upper Keys resorts.
Anyone with information on the case can call Crime Stoppers of the Florida Keys at (800) 346-TIPS. Crime Stoppers tipsters can remain anonymous and tipsters are eligible for a reward if their information leads to an arrest in the case.