which was as follows -- may 4th, 2006 around 2 p.m., the gps headed out toward catalina island. back side, where it seemed to putter around aimlessly in the middle of the night. then returned back to the dock 6:00 a.m. may 5th. that little device seemed to pinpoint the place and time of steven's murder. but how could detectives be sure the gps belonged to harvey and was on his boat? and then, what do you know. luck again. when harvey bought the gps, he took a friend. >> i was with him in the car when we picked it up. and it was such a cool gps. i've got one myself. >> that gps was a pivotal point in the investigation that really kind of sealed this whole case together. >> reporter: but though the gps evidence told detectives where harvey's boat was the day steven was killed, how could they be sure harvey and steven were together on the boat at precisely that time? >> electronic data is fascinating nowadays. very fascinating. our cell phones, we can also follow that signature. we were lucky again. >> reporter: lucky this time because of blackjack. blackjack cell tower, catalina i

>> along the surface of the pacific ocean on the far side of catalina island is a silent current. strange how it flows up to the swelling coastline of santa barbara. then just before the open sea turns back. to glide again past this storied island with one sunny day in may 2006, someone in it. >> i have a saying that i'd rather be lucky than good. >> reporter: ken clark is a detective with the l.a. sheriff's department. been at it a long time. as has robert martindale. more than 50 years between them. but nothing like the case that literally floated to them on a lonely reach of ocean out by catalina. would never have had the case at all, except -- >> we were lucky that we had some boaters leaving newport beach going to catalina island and they came upon a body floating in the water. >> just happened to see it? >> just happened to see it. >> that's a big ocean out there. >> absolutely. >> so the chances of it being seen are, what, needle in the haystack? >> very slim. >> reporter: the sailors had spotted a flock of shrieking seagulls perched on top of a body. it looked like it had

it's only the beginning of january, so, yes, we had snow there and the storm, look at catalina island. look at that. michael is right here. nevada. >> we need good images of weather. >> all that brought to you by progressive. >> you're right. your l >>> "good morning america" is sponsored by alka-seltzer plus powermax gels. sponsored by alka-seltzer plus powermax gels. that i would never le become a superhero. [singing indistinctly] but i learned how to fly. just to come back in a new disguise, and be the hero i've always wanted to be. >>> good morning, america. it's 8:00 a.m. new this morning, major shakeup in washington. just hours away from a new congress, the most diverse in american history. democrats prepare to control the house, ramping up the pressure as president trump digs in on the government shutdown. can the new divided government strike a deal? >>> major recall. the health alert right now about a common blood pressure drug. >>> deep fakes. the disturbing new trend being ramped up by technology. one person's face transferred to another's body. how it's being used against

most of it was mind on catalina island, and that was another item they would trade with the surrounding communities. had aan contact significant impact on the indigenous people. it was detrimental. rodriguez cabrillo came and discovered california, and claimed it for spain. gaspar de, in 1769, portolla came with spanish fathers and soldiers to establish the mission system in california. the nearest mission to santa monica is in san gabriel, so san gabriel is about an hour by car today, which was of course much farther if you are walking. the mission lifestyle was very harsh on the native people. they suffered from diseases. they suffered from the harsh living conditions. was -- there was such a thatficant culture change it was difficult and many did not survive. there were uprisings within the missions. at san gabriel, one of the most led by a-- famous was female shaman and orator, and tribe. within her this happened in the 1780's. she planned to attack the mission with other native men, planned an attack on the soldiers. it was unsuccessful and led to a court case. she was found guilty