Milwaukee police are holding the boyfriend of a 21-year-old woman who went missing over the weekend.  He was taken into custody as a person of interest before Shannon Mani’s body was found in a storage locker Sunday.  Investigators say Mani was shot and stabbed and they suspect the 27-year-old man of killing her.  She had been reported missing Saturday.  Mani was last seen at her family’s Waukesha home Friday.  A neighbor says fire trucks and a large police presence showed up at the boyfriend’s house Saturday night.  His name hasn’t been released.