District police boss Charlie Carver agreed the statistic could cause alarm, but reminded residents of the efficiency of police.
‘There have been six deaths, but every single one of those has resulted in people charged,’ he said.
He said it was impossible to predict when a murder was going to happen.
He recalled a time when he was confronted with 14 killings in a year, when working as an officer in Warwick in 1997.
He said drugs and alcohol often motivated murders, while others were crimes of passion resulting in devastating consequences where weapons were used.
‘You don’t know how people are going to react,’ he said.
‘The next thing you know people are dead.’
Four murder trials are currently before the courts.
Another two recent cases resulted in convictions.
The fatal Wanneroo shooting of Jeremia Iskander (21) in 2011 ended with Hayden Shane Wayne Joseph (then 23) and Damien Phillip Mathews (then 23) being found guilty of murder earlier this year.
Prosecutor Amanda Forrester told a Supreme Court jury Mr Iskander had fallen out with Joseph because Joseph owed him a drug debt.
On December 2, 2011, Joseph and Mathews confronted Mr Iskander at a Lalina Way home, the jury heard.
He was shot dead after a struggle ensued between the three young men.
The pair pleaded not guilty, with the defence arguing Mr Iskander was carrying the gun and it had gone off accidentally.
Joseph and Mathews will be sentenced on May 31.
On June 1, 2012, Jason Burton (41) was shot dead by his stepfather Bradley Thomas Daniel Auckram (52) at a Clarkson home on the corner of Farren Heights and Hyland Crescent.
Auckram pleaded not guilty to murder, claiming he shot his mentally-unstable stepson in self defence.
Earlier this month, a Supreme Court jury found Auckram guilty of the lesser charge of manslaughter. He will be sentenced in June.
Three months prior to Mr Burton’s death, David Blenkinsopp (30) went missing in the early hours of March 4, 2012, on Taywood Drive in Wanneroo.
His body was found at a bush site in Pinjar at the end of March.
Four people ” Damien Paul Kosick (37), Gary David Young (53), Kym Steven Foster (45) and Tamara Kathleen Broadbent (42) ” were charged over the killing.
They will stand trial in July.
On April 13 in Merriwa, a vehicle driven by Luke David Taylor (23) allegedly ran down Sudanese refugee William Maker (29) on Baltimore Parade.
It was reported to police Mr Maker had beckoned at Taylor to slow down.
Police initially charged Taylor with manslaughter but have since upgraded the charge to murder.
Taylor remains in custody and will face court on June 26.
Last Wednesday’s double killing in Girrawheen resulted in Nik Stoeski (36) being charged with the murder of his wife Vanesa Farcich (31) and friend Saso Filkovski (37).
Stoeski remains in custody.
He will appear in Stirling Gardens Magistrates Court on Wednesday, May 29.