The scholars have reached a consensus (ijma) based on the hadiths regarding locusts, affirming that it is permissible to consume them. It does not matter who catches them, whether they die on their own or are killed; they are lawful to eat.
Related hadiths include:
Ibn Abi Awfa (may Allah be pleased with him) narrates: “We went on expeditions (six or seven times) with the Messenger of Allah (peace and blessings be upon him). During the expedition, we ate locusts together with him.” (Bukhari, Hunting 13; Muslim, Hunting 52).
Salman (may Allah be pleased with him) reports: “The Messenger of Allah (peace and blessings be upon him) was asked about locusts. He said: ‘They are among the largest armies of Allah. I neither eat them nor declare them unlawful.'” (Abu Dawood, Foods 35; Ibn Majah, Hunting 9).
Abu Huraira (may Allah be pleased with him) narrates: “We set out with the Prophet (peace and blessings be upon him) for Hajj or Umrah. On the way, we encountered a swarm of locusts. We began to strike them with our whips and bows. The Messenger of Allah (peace and blessings be upon him) said: ‘Eat it, for it is considered from the sea game.'” (Abu Dawood, Rites 42; Tirmidhi, Hajj 27).