scarily similar to this
American Eagle Flight 4184, which also travelled through an area where icing was likely, they forgot to switch on the de-icing system because they were distracted by unnecessary private conversations with one of the flight attendants
were the pilots here too distracted?
a non-sterile cockpit can be fatal many times, during the flying there must be a sterile cockpit at all times, only things you are allowed to discuss is about whats going on during the flight, like that you can't forget any important steps to take in case of nasty weather ahead, other emergency situations
what was the relationship between the pilot and the first officer like, did they fly together more in the past years?
the way you can solve a plane crash's cause, is similar to a investigation by the police at a crime
gather a list of possible causes, and the one what's remaining, is likely to be the cause