( CNN ) -- Texas police on Friday released a composite sketch of a man they believe broke into the homes of four former members of the same sorority , then sexually assaulted them . No name has been given for the suspect in the alleged break-ins and attacks , which took place between November 2010 and October 2011 , according to a timeline from the Plano police . Detectives , however , do have `` a definite DNA profile on the suspect '' after a crime lab report , the police statement noted . Plano police in October released a video -- dated in April -- showing a man with a distinctive swagger who they believe is responsible . Snapshots from that video were distributed Friday . The alleged assaults occurred in the cities of Plano , Coppell and Corinth , all suburbs of Dallas . The alleged victims -- all females in their mid-50s to mid-60s -- were alumnae of the same predominantly African-American sorority : Delta Sigma Theta , according to police . They offered similar descriptions of their assailant as being a black male in his late 30s to mid-40s , weighing from 275 to 300 pounds and standing between 5 feet 7 inches and 5 feet 9 inches tall . `` He made it obvious to our victims that he knew information ... about them personally , '' Plano police spokesman Andre Smith said this fall , adding that none of the women believes they knew their attacker in advance . According to Corinth Police Capt . Greg Wilkerson , all the assaults occurred in `` residential settings '' between 9:15 p.m. and 4 a.m. when the victims were alone . The alleged attack in his city , 35 miles northwest of Dallas , took place on October 14 . The late-night setting , the fact the victims were often asleep and the alleged assailant 's `` attempts to conceal his identity '' make it challenging to definitively identify the attacker , said Wilkerson . Wilkerson said that the nature of the assaults suggest the alleged assailant was `` possibly suspecting surveillance , spending some time around the areas ... prior to the attacks . '' The police captain said authorities do not know how the suspect learned details of the victims , speculating it may have been over the Internet , by accessing an old directory or noticing would-be victims with Delta Sigma Theta jewelry , placards or other paraphernalia out in public . Delta Sigma Theta President Cynthia M.A . Butler-McIntyre this fall issued a statement urging members in the Dallas area to take precautions . `` To think that our members are being targeted is disturbing and extremely disheartening , '' she said .
Plano , Texas , police distribute composite sketch of the sexual assault suspect . Comment: The person who did it is a serial rapist and murderer that has been on the run for years now. They were all alumnae of the Delta Sigma Theta sorority . The alleged attacker , black and in his 30s or 40s , knew personal info about his victims .