OceanGate CEO and pilot Stockton Rush was killed in the implosion along with two members of a prominent Pakistani family, Shahzada Dawood and his son Suleman Dawood; British adventurer Hamish Harding; and Titanic expert Paul-Henri Nargeolet.

Source: https://chicago.suntimes.com/2023/6/28/23777795/human-remains-have-likely-been-recovered-from-the-titan-submersible-wreckage-u-s-coast-guard-says

Shahzada Dawood and his son Suleman died alongside Paul-Henri Nargeolet, Stockton Rush and Hamish Harding.

Source: https://www.independent.co.uk/news/uk/paulhenri-nargeolet-shahzada-dawood-rush-christine-stockton-rush-b2362780.html

The other people on board were: OceanGate Expeditions founder and CEO Stockton Rush, British billionaire Hamish Harding, and renowned French diver Paul-Henri Nargeolet.

Source: https://www.bucksherald.co.uk/news/tributes-after-former-university-of-buckingham-student-and-son-died-on-titanic-submarine-4195051

The others on board were two members of a prominent Pakistani family, Shahzada Dawood and his son Suleman Dawood; British adventurer Hamish Harding; and Titanic expert Paul-Henri Nargeolet.

Source: https://gazette.com/ap/the-titan-submersible-imploded-killing-all-5-on-board-the-us-coast-guard-says/article_8a7a03ea-587e-56c8-80e9-e66ecc0e72e6.html

Titan submersible passengers (clockwise from top left): explorer Hamish Harding, OceanGate Expeditions CEO and founder Stockton Rush, Shahzada Dawood and his son Sulaiman Dawood; and Titanic expert Paul-Henri Nargeolet.

Source: https://nypost.com/2023/06/22/titan-submersible-implosion-likely-so-fast-victims-never-knew-expert/

We now believe that our CEO Stockton Rush, Shahzada Dawood and his son Suleman Dawood, Hamish Harding, and Paul-Henri Nargeolet, have sadly been lost.

Source: https://gcaptain.com/debris-field-found-in-search-for-missing-titan-sub/