The actress' 1981 death was ruled accidental and new information which prompted the reopening of the case in 2011 proved inconclusive.
However, earlier this month (Jan13) Wood's death certificate was amended after a new Los Angeles County Coroner's report concluded that bruising on the actress' body was consistent with injuries from an assault before she fell into the water of the coast of California and drowned.
Wagner has maintained that his widow fell into the icy waters near Catalina Island from the couple's yacht for over three decades, and his lawyer, Blair Berk, insists the star has no more information to give to investigators.
Berk tells E! News, "Mr. Wagner has fully cooperated over the last 30 years in the investigation of the accidental drowning of his wife in 1981. Mr. Wagner has been interviewed on multiple occasions by the Los Angeles Sheriff's Department and answered every single question asked of him by detectives during those interviews.
"After 30 years, neither Mr. Wagner nor his daughters have any new information to add to this latest investigation, which was unfortunately prompted by those seeking to exploit and sensationalize the 30th anniversary of the death of his wife and their mother."