Published: Apr 05, 2013 10:55 AM EDT

HALLANDALE BEACH, Fla. (AP) - Police in Hallandale Beach say robbery may have been the motive behind the January slayings of a Canadian couple inside their condominium.
    
Authorities said Thursday that an inventory of the condo's contents revealed that a $16,000 wedding ring belonging to Rochelle Wise was missing. Police are asking local pawn shop and jewelry exchange businesses to look closely for the ring, which is platinum with five half-carat white diamonds in a half-moon shape. It may have the letters "DCC" engraved inside the band.
    
A $51,000 reward was previously offered for information leading to arrests in the asphyxiation deaths of the 65-year-old Wise and 71-year-old Richard Pichosky. Both are from Toronto but spent winters in South Florida.
    
Police previously released surveillance video showing an unidentified woman leaving condo's back door.

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