Dean originally came up in 1967 as a member of the Los Angeles Dodgers, appearing in 12 games towards the end of the season and batting .143 with four hits over 28 at-bats.
After spending 1968 in the Minors, he was traded by the Dodgers along with Leon Everitt to the Padres for pitcher Al McBean, and got some consistent playing-time at shortstop, though he hit for a low .176 batting average over 308 plate appearances.
In both 1970 and 1971 he saw limited action, 61 and 41 games respectively, filling in at short, second and third while batting under .200 combined.
For the 1971 season, his last, he hit .114 with eight hits over 70 at-bats, all singles, with an RBI and two runs scored.
Oddly, I have no record of him playing in any level of Pro ball after this MLB time in 1971, according to Baseball-Reference.
Curious to know what, if anything, happened.