>> reporter: police even looked into susanne's shopping habits and found something that intrigued them. susanne bought her groceries at a nearby shoprite, a big supermarket chain. in fact, she was a creature of habit, visiting there 22 times in the month prior to peggy's murder. but on the 23rd time, the night before peggy's murder, susanne shopped at a different store, the one near her mother's house. what did she buy? >> she bought cleaning supplies, rubber gloves and some other items like that. >> reporter: had the crime scene been cleaned up? detectives didn't think so. but still found it suspicious. just before your mother was murdered, you go to the shoprite. not the one near your house. the one near your mother's house. >> mm-hmm. >> reporter: and you buy rubber gloves and cleaning supplies. >> i did. i mean, i buy cleaning supplies all the time. i have a cleaning girl. she probably needed rubber gloves. she probably needed floor cleaner. that's interesting.