Authorities arrested the boyfriend of a Louisiana mom “brutally murdered” after one of her two kids was found dead in the Mississippi woods Thursday, putting a tragic end to an AMBER Alert issued earlier in the day. Four-year-old Erin Brunett’s body was dumped in Jackson, Mississippi, in a wooded area near the stolen getaway car driven by her alleged kidnapper, Daniel Callihan, authorities said, according to WVUE-TV. Erin’s 6-year-old sister, Jalie, was found alive in the vehicle. “You don’t want to see that as a police chief; you don’t want to see that as a father,” said Jackson Police Chief …