Hollywood filmmaker Rob Reiner and his wife Michele Singer Reiner were found dead in their Los Angeles home on Sunday. The police and investigators believe the couple suffered fatal stab wounds.On Monday, police arrested the legendary director’s 32-year-old son, Nick Reiner, in connection with the deaths.Recommended Stories list of 3 itemsend of listRob Reiner directed several United States movie classics, including When Harry Met Sally and The Princess Bride. He was also a devoted activist for liberal causes and a frequent critic of US President Donald Trump.So, what do we know about Nick Reiner, and what was his alleged involvement in his parents’ killing?Who killed Rob Reiner and his wife?Nick was revealed to be in Los Angeles police custody on Monday after the bodies of his parents were discovered inside their home in the upscale Brentwood neighbourhood.The Los Angeles Fire Department said it responded to a medical aid request shortly after 3:30pm on Sunday [02:30 GMT Monday], and found a man and woman dead inside.Rob Reiner’s daughter was the first to find the bodies of her parents and called the authorities, according to multiple reports.In a statement, the Los Angeles Police Department said it was treating the deaths as homicides. Police have not released a full official timeline of how the killings occurred or the motivation behind them.Nick Reiner remains in custody without bail. On Monday, Los Angeles Police chief Jim McDonnell said Nick Reiner was “booked for murder”.Prosecutors will receive the case on Tuesday as they weigh whether to file formal charges against him.Who is Nick Reiner?Nick Reiner is the middle child of Rob and Michele Singer …