User blog comment:Dtuck010/Who killed Tula and drove aqualad to black manta?/@comment-4821105-20120513163018

According to episode and Nightwing:

- Tula/Aquagirl was on team and went to a misson and she sacrefice herself to that Young Justice´s Team could complete and sucessful on their misson. Tula knew the risks of that misson.