For more than a decade, Kelly Phillips and Lyle "Ty" Hoffman had a personal and professional relationship.
On Monday morning, long after both had soured, Phillips, a 48-year-old executive with Boston Scientific, lay dead on the pavement of an Arden Hills gas station and Hoffman was on the run, identified by police as a suspect in the slaying.
Authorities didn't say Tuesday why Hoffman, a 44-year-old commercial developer, is suspected in the gruesome shooting death. He and Phillips had operated a northeast Minneapolis nightspot together, and they had lived together up until about three years ago.
As of Tuesday night, no one had been arrested and Hoffman's whereabouts were unknown.
Earlier in the day, police swarmed an area near the Anoka County-Blaine airport, not far from where authorities found the BMW driven by the man who shot Phillips.
Authorities searched the two hangars, believing that Hoffman may have slept inside one of them because he was familiar with the area and knew how to get inside at least one of the buildings.
They also searched the area where the BMW was found just outside the airport, next to a golf course. Authorities did not find the gun in either of those searches, they said Tuesday night.
Working off the theory that Hoffman may have been the killer, investigators Tuesday were busy trying to figure out what brought him and Phillips together Monday morning, and whether Hoffman may have caught Phillips by surprise, a Ramsey County law enforcement official said.