Authorities on May 5 arrested a 17-year-old male accused of murdering a 61-year-old woman who was found dead on April 21. Local outlet Las Vegas Review-Journal  identified  the suspect as Dennis Geiggar, a high school student with a reported history of behavioral issues and anger-related incidents.  He is accused of killing 61-year-old Marceline Biasini, who the Review-Journal reported regularly slept in the area where she was found dead. The victim was found lying on the sidewalk outside a business and “suffering from apparent injuries” just after 8 a.m. on April 21, the Las Vegas Metropolitan Police Department (LVMPD) told Fox News Digital. Nearby surveillance video captured a brief, suspicious encounter in the middle of the night, showing a suspect approaching the victim’s area and leaving about a minute later, the Review-Journal reported, citing police records. A former Valley High School student, Dennis Geiggar, is accused of murdering a 61-year-old woman in Las Vegas, NV.…