Investigators have found DNA evidence. Sacramento County Sheriff John McGinness said the DNA evidence was gathered from a critical location at the scene where Deputy Jeff Mitchell was killed. "The DNA was found at a very critical, specific location at the scene and we've determined that the donor is a person other than Officer Mitchell," McGinness said. McGinness said the evidence significantly increases the chances that investigators will be able to solve the case through scientific means. He said the profile derived from the new evidence will be matched to criminal DNA databases. It also will be compared to DNA from "persons of interest" interviewed by investigators. So far, investigators have received 1,805 leads and have followed up on 1,769, the sheriff said. McGinness also said damage to a fence at the crime scene believed to have been caused by a white Chevy van linked to the shooting is not connected to the case. It is now believed the van did not sustain any collision damage at the scene of the crime. McGinness said officers continue to search for any white or light-colored van that may have been in the area at the time of the shooting. Meanwhile, thousands of law enforcement officers from across the state are expected to in attendance today at a memorial service for Mitchell.The service will take place at 11 a.m. at Raley Field in West Sacramento and will be followed by a procession to the Elks Lodge in the Pocket area.