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A Topic Modeling
To better understand the topics related to suicide in the SuicideED dataset, we run a topic modeling analysis using Latent Dirichlet Allocation (LDA) (Blei et al., 2003) over the documents in the dataset. We extract ten topics from the analysis and present their words in Table 4. English stop-words, the least  $(p < 0.01)$ , and most frequent words  $(p > 0.2)$  were removed in the analysis. Interestingly, it can be observed that posts can be summarized into 3 main categories: school (2, 8), work (5, 9, 10), and family (3, 4, 6, 7), which somehow reflects the sources of mental issues.
#	Words
1	hate, thoughts, point, stop, care, say, worse, living
2	wish, hate, worse, try, year, shit, school, thoughts
3	world, parents, suicidal, right, bad, point, person
4	tell, love, tired, days, person, doing, death, mom
5	pain, real, tried, need, maybe, work, hurt, tired, talk
6	care, told, tired, said, parents, bad, need, leave, right
7	care, matter, getting, days, actually, feels, parents
8	got, school, said, talk, doing, self, love, mental, work
9	job, happy, got, year, love, hate, try, told, money
10	love, shit, job, work, suicidal, night, pain, right, year
Table 4: Topic models with LDA
Table 5 and 6 present a detailed description of event types and examples for each event type in our SuicideED dataset.
Type	Description	Examples
ACTION	This category includes any event of an individual engaging in actions that bring them closer to dying by suicide. These include any previous suicide attempts, preparatory acts towards a future attempt, or self-inflicted violence. When annotating this type of event, it is important that an actual action takes place and that it goes beyond verbalization or intent. As such, sentences containing these events mainly talk about the past or ongoing situations.	A previous suicide attempt is a self-inflicted, potentially injurious behavior with an intent to die as a result.I tried to kill myself last night.
A preparatory act consists of any acts of preparation toward making a suicide attempt. Must be beyond verbalization or thought such as assembling a method (e.g. buying a gun, collecting pills) or preparing for death (e.g. writing a suicide note and a will).Just looked online for the quickest wayI left a note for my parents
Self-inflicted violence includes self-directed, harmful behaviors that do not have a clear intent to die as a result.I've started cutting myself again
IDEATION	These events focus on expressing thoughts and feelings but no actual action is present. These, however, are not related to actions such as preparatory acts and, instead, refer to verbalizations of inner feelings/desires.	It includes passive thoughts about wanting to be dead:I wish I was deadAnd, active thoughts about killing oneself.I am going to kill myself soon
PROTECTIVE	These events are related to capacities, qualities, environmental and personal resources that increase resilience; drive an individual toward growth, stability, health, and/or an increase in coping with different life events. For this category, please annotate any sentence that showcases a positive impact on an individual. These can be verbalizations of self-worth and willingness to get better, access to medical resources, positive personal relationships, positive cultural beliefs, etc.	Access to effective behavioral health care and medication:My therapist says that I should talk more.The medication seems to be helping.
Connectedness to individuals, family, community, and social institutions:At least my friends are there for me
Life skills (including problem-solving skills and coping skills, ability to adapt to change):I've always been good at helping people
Self-esteem and a sense of purpose or meaning in life:My life is much better than many people.
Expressing a willingness to improve:I really want to get better.I wanna be funny and outgoing.
Cultural, religious, or personal beliefs that discourage suicide:I know God disapproves of what I'm thinking.
Table 5: Event types with their descriptions and examples in the SuicideED dataset. Event trigger words are shown in bold. Continued in Table 6
Type	Description	Examples
RF - LIFE	This risk factor event is easy to identify as a loss of life of a both human and non-human entities. The loss of life might be explicitly or implicitly expressed.	Loss of a relative, explicitly expressed:
After my brother killed himself...
Loss of a relative, implicitly expressed:
My grandma has been gone for years now.
Loss of a pet friend:
My dog just died, he was my only real friend.
RF - RELATIONSHIP	These include events such as social isolation, family breakdowns, divorce, etc. Include in this category all events that show a loss of connection with other people. These can be both verbalization of feelings of isolation or actual incidents of loss of an interpersonal relationship such as a break-up or argument with another individual.	Social isolation:
I don’t have anyone to talk to.
Family breakdown:
My dad just kicked me out of the house.
Divorce:
After my divorce, I started drinking
RF - HEALTH	These include events such as social isolation, family breakdowns, divorce, etc. Include in this category all events that show a loss of connection with other people. These can be both verbalization of feelings of isolation or actual incidents of loss of an interpersonal relationship such as a break-up or argument with another individual.	Mental disease/disorder such as depression, PTSD:
Can’t deal with my depression right now.
I’ve been diagnosed with BPD.
Chronic or long-term disease, pain, and disability:
I’m just giving into my eating disorder.
Recently, my diabetes has been acting up.
Misuse and abuse of alcohol or other drugs:
I’ve been drinking a lot lately
RF - OTHER	These events include all other risk factors that do not fall into the LIFE, RELATIONSHIP, or HEALTH categories. As such, these can be events of very diverse natures such as financial issues, chronic abuse, discrimination, or general quality of life problems.	Financial hardship:
Can’t afford to pay rent anymore...
Prison:
I can’t go back to jail now.
Job loss:
Lost my job today.
Discrimination
They tease me in school cause I’m gay
Table 6: Event types with their descriptions and examples in the SuicideED dataset. Event trigger words are shown in bold.