Well, according to Dr. Byron Rourke, one of the leading researchers of Asperger's "sister disorder" (for want of an ideal term) NLD/NVLD...suicide risk is elevated for individuals who exhibit the NLD/NVLD syndrome.
I see no reason to believe suicide risk isn't similar among those with AS. Not to mention the fact that AS and NLD might even be the same disorder and the professional jury is still out on that one. Many of those with AS exhibit a strikingly similar pattern of performance to NLD-ers on IQ tests and other psychometric/neuropsychological measure for one thing. The social/behavioral characteristics seem quite similar often enough as well. Some psychologists claim these characteristics are appreciably more "mild" for NLD-ers though. Basically I think we're just looking at a common etiology which just has variable quanties and qualities of manifestations in individuals.
One thing which may suggest that NLD and AS aren't the same is that most, if not all, the common NLD characteristics can be aquired (via head injury, radiation treatments for childhood cancers like lymphocytic leukemia, etc...) whereas AS cannot be.
"Summary & Related Considerations
The pattern of psychosocial disturbance exhibited by persons with NLD is considered to arise directly from the interactions among their primary, secondary, tertiary, and linguistic neuropsychological assets and deficits. For example, their deficits in social judgment and interaction appear to result from more basic problems in reasoning, concept-formation, and intermodal integration-- problems that also lie at the root of their difficulties in mechanical arithmetic (Rourke, 1993; Strang & Rourke, 1983). Adaptability to novel interpersonal situations is the hallmark of socially appropriate individuals. A combination of aversion for novelty, failure sometimes even to appreciate that an event is in fact novel, poor problem-solving and hypothesis-testing skills--all of these conspire to render spontaneous, smooth adaptation to the constantly changing milieux of social groups and the interactions nascent therein all but impossible for the child or adult with NLD. Deficits in visual-perceptual organizational skills are thought to give rise to their problems in deciphering the meaning of various facial expressions, gestures, and other forms of paralinguistic information important for effective human communication.
Included among the adaptive difficulties that arise from limitations in the capacities of the person with NLD for intermodal integration are the following: problems in the assessment of another's emotional state through the integration of information gleaned from his/her facial expressions, tone of voice, posture, psychomotor patterns, and so on; limitations in the assessment of social cause-and-effect relationships because of a failure to integrate data from a number of sources such as is often necessary to generate reasonable hypotheses regarding the chain of events in social intercourse; failure to appreciate humor because of the complex intermodal judgments required for assessing the juxtaposition of the incongruous; imputing of unreasonable, trite, or oversimplified causes for the behaviour of others, and imparting such imputations in situations that would lead to embarrassment for the person so described. Clumsiness and poor psychomotor skills (e.g., eye-hand coordination), coupled with the aforementioned difficulties, make it likely that such individuals will be regarded as social misfits. As a result, they are often ridiculed and ostracized. Because of these experiences, it is expected that there will be an increased likelihood of social withdrawal, isolation, and depression on the part of the person with the NLD syndrome. Thus, it should come as no surprise that depression and suicide attempts are greater than average in individuals who exhibit this syndrome. Additional information and discussions of the psychosocial dimensions of NLD are contained in Rourke, van der Vlugt, & Rourke, 2002)."
http://www.nld-bprourke.ca/BPRA18.html