Looking at the data it doesn't look like he ever started climbing (again)after an approach. The final two data entries start at 4,900ft and for Vertical Speed they were 1500fpm then 1680fpm descending. That makes me think something along the lines of the pilot became incapacitated m aybe and the plane nosed over with nobody to recover in the right seat.
A couple years ago (circa 2010,) Santa Monica airport re-surfaced their only runway, thus shutting the airport down for a few days. You should have seen the things these green-preaching, prius-driving california nuts were saying; I'll never forget (and I quote from memory): "Oh with the airport closed down we can finally breath CLEAN AIR, something we haven't had since the day we moved in - our kids are always coughing... you know, 'cause of the chem trails..." Icing on the cake, the clip they put on the t.v. of the polluting plane was from 1993.