Const. Eric Hofley said many units of the police service are still involved with the search for the 57-year-old woman, but "due to the suspicious nature of the disappearance," the homicide unit is taking control.
That unit also has more resources to dedicate to the investigation, "but at the end of the day, we're still treating it as a missing person [case]," he said.
The police once again pleaded with the public for their assistance in the investigation, with Hofley urging "anyone with any information" to come forward.
Sometimes the most seemingly minor information "can be the crumb that leads [investigators] to an outcome," he said. "We're grasping at straws."
The public has been asked to check their properties for anything suspicious and review surveillance footage if they have security cameras.
Krull was last seen on the morning of July 11, when she said she was going for a walk in the north part of Transcona.
On Wednesday, police released security footage from a home in the Harbourview South area that shows Krull walking by just before 7:30 a.m.
Investigators said Friday they believe she was in the area of the Kimberly Avenue toboggan hill between Valley Gardens Community Club and Kildonan East Collegiate at about 8 a.m. that same morning.
On Friday, police released an image of two people who were cycling in the area around the same time. Investigators do not believe they are suspects but want to identify and speak with them to determine if they might have seen anything.
"We would welcome hearing from anyone who was in that area Saturday morning — playing tennis, walking or going for a jog — on the off chance you saw something that could help further this investigation," Hofley said.
Earlier this week, investigators found Krull's eyeglasses near the Valley Gardens Community Centre.
The union representing Winnipeg Transit workers is offering a $5,000 reward for information that helps investigators locate Krull. Her husband, Robert, has worked as a bus driver since 2007.
Krull is described as 5-4", 170 pounds, with short dyed blonde hair with a purple streak. She was last seen wearing black capri style pants, a reddish-orange shirt, hiking boots and glasses.