According to the Toronto Life article written 10 years ago (2008 -
https://torontolife.com/from-the-archives/barry-sherman-bitter-pill-from-the-archives/), BS was then driving a 2005 Sebring convertible (only 3 years old?). From what we've read, he wasn't much into vehicles and had a history of driving his vehicles into the ground before he would, seemingly begrudgingly, replace them (he was reported to have only owned 4 vehicles in his lifetime).
So fast forward 10 years, there are 2 vehicles outside the home, only one of which (reportedly the vehicle HS drove) has been reported as having been towed away by police (presumably for forensic examination). ("On Thursday, the same day that
a large memorial service was held for the couple, police were also seen towing a champagne-coloured Lexus SUV from the property. Neighbours told CTV Toronto that it was the vehicle that Honey would drive." -
https://www.ctvnews.ca/canada/police-seen-searching-sewer-roof-of-sherman-mansion-1.3734344)
Then a month after their deaths, a second vehicle is brought out from the underground garage, to also be towed away by police. A 1999 Ford Mustang, reportedly owned by HS. Police seem to only be interested in HS's vehicles?
I wonder if HS had tried to commit suicide by carbon monoxide poisoning in the garage, and was discovered by her husband, who then dragged her to the pool area to remove her from the fumes, and subsequently discovered he could not save her, and so finished the job by trying to make it look like perhaps a double murder/assassination, and taking his own life too?
Police stated the COD for both as being 'ligature neck compression', but that doesn't rule out the possibility of an earlier, unsuccessful attempt at ending HS's life, by another method. It may also explain why LE hasn't said yet that it was a murder/suicide, or suicide/suicide (maybe it is complicated)? Why would they be interested in an old vehicle that nobody drove which was stored in the garage? (Could they have removed some other piece of evidence from the crimescene which they didn't want the media to see or become aware of, hiding it inside the Mustang, under the guise of wanting to examine the vehicle?)
Just random thoughts...