This article includes a better picture of the bag, and it doesn't appear that the wheels are broken (warning: the photo shows blood).
Also, they really couldn't let the 13-year-old put on shoes before taking him to the station?
Mystery Deepens in Savage Killing of Mom Left in Hockey Bag – Daily Beast
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The blood led police through the leafy lanes to the side door of the $2 million Tudor house at 72-24 Juno Street, where 51-year-old Orsolya Gaal lived with her husband and two teenage sons.
The police executed an emergency entrance and saw much more blood on the first floor and even more in the basement. The medical examiner would identify the woman in the bag as Gaal and determine she had been stabbed 58 times.
“We think the attack happens on the first floor,” a senior NYPD supervisor familiar with the investigation told The Daily Beast. “
We think he then goes to the basement to figure out, you know, how to clean up the mess and get rid of her.”
[...]
Gaal’s husband, 51 year-old Howard Klein, was in another part of the country touring colleges with their 17-year-old son at the time of the murder.
The only person home at the time was a 13-year-old son, who police found on the top floor. He was apparently unaware of the horror downstairs, but
was brought in for questioning, arriving barefoot at the station house, somebody who was present told The Daily Beast.
The son was soon after released. The NYPD supervisor said this was in part because police had recovered surveillance video of a figure who was clearly not the son pulling the wheeled hockey bag along what was becoming the blood trail shortly after 4 a.m.