11:16 AM PT -- Nick Reiner 's original $4 million bond has been changed ... he's now being held without bail. Rob and Michele Reiner 's son Nick has been arrested and is being held on $4 million bail, TMZ has learned. The 32-year-old is in the custody of the Los Angeles Police Department as of Monday morning, according to online records. He was booked at the LAPD jail. As we reported ... the couple was found by one of their daughters Sunday with their throats slit inside their Los Angeles home.