For a study, we sent out a questionnaire to members of the general public. The questionnaire was containing items related to well-being and happiness, among other items that are completely related to my field (computer science).
One respondent wrote about having suicidal thoughts because of personal issues. No signs of seeking treatment in the reply.
The participant left their e-mail address in the field "contact me back for the results and/or further clarifications".
What is my role here as a researcher? My first thought was to contact the participant and pointing them to seeking help (maybe also providing links to their national suicide prevention programs).