This paper applied time series analysis to examine the nexus between firearm robberies and homicide in Hong Kong Special Administrative Region (HK). Recent years have seen a reduction in firearm related offences in HK compared to Britain. For instance, only three cases of firearm robbery in 2004 in HK (0.1% of all robbery; 2,237 incidents) involved genuine firearms, compared to 4,117 firearm robbery incidents (4% of all robbery) in Britain in the same year. This paper established a cross-correlation coefficient of 0.50 at lag 0 for the annual rate of two serious crimes, genuine firearm robbery and homicide, after identifying an ARMA(1,0) model from each time series . The results suggest that the prevalence of firearm robbery is moderately associated with the prevalence of homicide in HK.