"Owning Manhattan" star Jade Shenker is raising serious questions over the death of her father Marc ... as she isn’t convinced cops are on the right track, TMZ has learned. The Netflix star tells us she isn't buying the authorities' preliminary findings that her father's death appears to be natural and to not raise any concerns ... saying she’s in the process of ordering a private autopsy to take a closer look. Hollywood Police in Florida confirm to TMZ that officers responded to a death