Former MLB pitcher Dan Serafini was convicted Monday of first-degree murder of his father-in-law and attempted murder of his mother-in-law over a financial dispute. Serafini, a 51-year-old who spent seven seasons in the majors from 1996-2007, was found guilty in the 2021 shooting of 70-year-old Robert Gary Spohr, and in the attempted murder of Spohr’s…