The 40-year police veteran, who has spent the past 23 years as part of the Homicide Squad, took those present through the intricate processes of major and serious criminal investigations.

Organiser Donna Wood said the evening was a great success for the College, with the money raised to go towards the school's pastoral care program.

"For many of us, the world of investigation holds a strong fascination. Ron walked us through the initial stages of assessing a crime scene," she said.

"Ron spoke about many cases, some well known and some which did not attract as much media attention. He stressed the importance of communication between people - not simply relying on Facebook or text messaging. Reaching out to our fellow man is essential and, he believes, could have avoided many murder-suicides."

The cases which Det Sen Sgt Iddles touched on had all been in the public arena and been through the legal processes of the Victorian courts.

The 2010 death of Gurshan Singh Channa, a three year old boy from Lalor was the first case study.

Det Sen Sgt Iddles explained the dilemma of pinpointing the cause of death and the circumstances of how his small body was found in Oak Park, some distance from his home.

"With forensic evidence and meticulous statement taking, police pieced the jigsaw of tragic events together and zeroed in on a suspect. This man was eventually interviewed and charged with manslaughter by criminal negligence," Ms Wood said.

"The actual interview between Iddles and the offender was shown, illustrating Ron's patience, understanding and respect for both the deceased child as well as the offender."

The case of the murder of Peter Rule in 2009 proved to be another case of meticulous investigation as well.

"Tracing the last movements of Rule as well as corroborating information regarding the offenders showed the tenacity of detectives to bring about justice," Ms Wood said.

Ms Wood said Det Sen Sgt Iddles' experience in dealing with people during his long and outstanding career warranted his expert opinion on many issues.

"It is most certain that Ron is a man of integrity, compassion, understanding, respect, fairness and strength. An example was his attendance at gangland figure Victor Pierce's funeral in 2002," she said.

"Ron's main interest in proceedings involved other gangland attendees. However, Pierce's daughter Kate gave a eulogy citing how much she loved her father and some of the nice things and occasions they had shared. In Ron's eyes, Kate deserved the same stamina and vigour in seeking her father's killer as everyone else."

Ms Wood thanked all the sponsors for their support, along with Det Sen Sgt Iddles for his time.

"We were really, really pleased with the night and we're hoping to do another one next year, which will be different again," Ms Wood said.