Authorities have now released the identity of the man killed in a house explosion in the Town of Lebanon Sunday morning. Killed in the blast was 64 year old Mark S. Zielke. Waupaca County Sheriff Tim Wilz says its likely that Zielke was sleeping when his home blew up around 8:45 a.m. Zielke was pronounced dead at the scene, at the residence near the intersection of County Highways “N” and “T”, east of Manawa. No one else was injured. Officials have not determined a cause of the explosion. Their investigation continues.