the long plane ride to hawaii, all sisters tammie and tiffany knew was that their mom was on life support. they weren't sure why or even what exactly happened to her but during those six hours they had plenty of time to reflect on what she said to them nine months earlier. >> promise me you'll investigate. if anything happens to me, you'll find out what happened. >> they'd promised, of course. though even before they even got on the plane for hawaii, they called the police to report that they already had their suspicions. and those suspicions were all about shirlene's husband, ken wakisaka. >> i heard from tiffany before i even went to st. francis west. i was assigned the case by my lieutenant, and he said, "before you go, call this girl. " >> tiffany told detective nick cambra about her pre-flight conversation with the hospital. >> i asked the emergency room