It is the wisdom that all of life is a mixture of suffering and joy. Following a suicide death, you will need all the friends you can get. Family and friends who are willing to listen to you talk are a major source of support. Another important source of support is the written word. Books are available any time, night or day, whenever you need them, whereas people may not be.
Writing is especially helpful.
Like reading, it is available when people aren't. It also allows you to express everything you feel, including your anger, without hurting others. People should not expect much from you for a long time. Fellow workers and friends need to know that recovery can take as long as 2 - 3 years. Anger is a natural reaction to having been hurt.