A 20-year-old college student killed himself after seeing a negative $730,000 balance in his Robinhood account

· A Robinhood trader died by suicide following a mishap on the free stock-trading app, his family says. 
· Alexander Kearns, 20, apparently saw a massive negative cash balance while trading options contracts. 
· His family wants answers from Robinhood about how this happened and how it can prevent future incidents. 
·...