La Crosse’s incoming police chief is receiving daily updates on the investigation into the killings of camera shop owners Paul and A.J. Petras.

Ron Tischer, a police captain from Waukesha, will be sworn in as police chief on Thursday.

“I am really impressed with how much legwork and time and the number of people the investigators have talked to,” he said Friday.

Those interviews included students from a photography class that took place shortly before the store closed, police said this week.

The slayings of Paul, 56, and his 19-year-old son, A.J., at May’s Photo, 425 Main St., are believed to have occurred sometime between the shop’s closing at about 2 p.m. when the class ended, and 5 p.m. Saturday, according to police.

Police were called to the store at 5:24 p.m. after Paul Petras’ wife, Sherri, went to the shop to check because he hadn’t returned home at his usual time.

The killings, which raised the city’s homicide toll this year to four, have spurred a massive investigation that includes state and local law enforcement.

Police released no new information on the case Friday.

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