Many Pakistanis believe he is - there seem few other credible explanations as to why he was going around Lahore with a Glock pistol in a car with local number plates without informing local authorities. It is a requirement for embassy staff - especially those from Western embassies - to inform local police of their movements, simply because they are prime targets for militants in Pakistan. Mr Davis's department in the US embassy is widely seen in Pakistan as a cover for Central Intelligence Agency (CIA) operations. Mr Davis himself said he was a consultant employed by the US government. Researchers in the US say that since leaving the military, Mr Davis worked for a security firm called Hyperion LLC. But subsequent investigations by the US media have now shown that Hyperion exists only as a website. The offices that the company says it has in Orlando have been vacant for several years and the numbers on its website are unlisted. Mr Davis insists he was acting in self-defence.
Maybe. It all depends on how eager the Pakistani authorities are to punish him. The fact that he is possibly a spy does not mean he is not covered by diplomatic immunity. It is common practice for intelligence services across the world to send operatives under the cover of assignments to embassies. Both Pakistani and US "diplomats" have been caught in such situations - and every time have been asked to leave the host country immediately with no possibility of a return. That is the maximum punishment that has been levied in the overwhelming majority of cases in countries which have signed the Vienna Convention. However, in some countries there are exceptions for serious offences committed, such as murder. Pakistan is one of those countries. The matter is now in the hands of the judiciary. But it is important to remember that Mr Davis has been charged with murder - the maximum sentence here is the death penalty.
In his initial statement, Mr Davis said they were robbers who were trying to steal his valuables. He and the US embassy have maintained this story. However, the men have no criminal records as such. Both have been identified as residents of Lahore by the police. The pair were carrying licensed pistols - a fact which led many to believe they might indeed have been robbers. However, security sources in Lahore say that they were part-time or low-level operatives for the local intelligence services. Although reports are sketchy about what they were doing in relation to Mr Davis, security officials believe it could be the case of a surveillance operation gone horribly wrong. Pakistani intelligence services routinely tail and monitor all embassy staff, Western or otherwise. A third man on his motorbike was killed in the incident by a mystery US car