buckle, and the prosecution hit its stride. an expert told the jury that the baby died between december 23rd and december 25th. another expert told the jury that laci's decomposition was consistent with three to six months in the water. and a search dog handler testified her dog picked up laci's scent at the berkeley marina and said the prosecutors it was obvious scott peterson knew laci and he'd even turned connor's nursery into a storage room. >> put office furniture and pillows and a locking device form a car in there. scott wasn't expecting conner to ever come home. >> coming up -- a cheater, a liar, but a killer? i mean really, who else could have done it? >> i'm glad you asked that question. >> when "dateline" continues.