Terrance Luukkonen, of Duluth, Minn., was shot in his vehicle outside his workplace in Superior last May.
Forty-two-year-old Juan Padilla, of Fort Mojave, Ariz., is charged in his death.
Padilla's trial was scheduled to begin May 5. But a Douglas County judge has delayed the trial at the request of Padilla's public defender.
Attorney Patrickj O'Neill says an analysis of the phone records conducted by the Wisconsin Crime Lab was received last week and the defense needs time to review it.
WDIO-TV reports prosecutors say a cell tower 'ping' from a phone that belonged to Padilla could place him in the city at the time of the homicide.