Raj Singh is an employee of the IT Department of the same police station as Beth and Art. He had a crush on Beth Childs.
When Helena disguised herself as Beth in "Effects of External Conditions", Raj first noticed and pointed out her unkempt and fatigued appearance which a puzzled Helena ignored and responded to with a stare. Thinking his remark was unwanted, he left it at that. When he sees the real Sarah, who was also posing as Beth, return with Art, he complimented her change of look, to which Art responds and tells him to "keep it in his pants". Embarrassed, Raj walks away.
In "Conditions of Existence", he calls "Beth" to remind her to return the surveillance equipment that the real Beth had previously borrowed from him weeks before. He also asked her whether or not she had used the equipment on Paul.