It has been been six months and 18 days since Pastor Koh was kidnapped in broad daylight on 13 February in Petaling Jaya.
With little information as to what happened to Pastor Koh, his wife, Susanna Liew, has written an open letter to Inspector-General of Police Khalid Abu Bakar regarding the case.
61-year-old Susanna Liew Sow Yoke expressed her disappointment over how her husband's case has been handled by the authorities, stressing on the fact that her family wasn't prioritised in terms of updates on the case.
"The police have not handled Raymond's abduction as you usually handle other kidnapping cases, especially in the way you have withheld the coordination and communications support normally given to families of kidnap victims," read the letter, as reported by Malaysiakini.
"Why are you doing this? If this sensational story is based on a logical and credible line of inquiry with verifiable evidence, then why not update me accordingly?"
Liew also slammed IGP Khalid for speaking to the media before updating the family regarding her husband's abduction.
"If there is no credible evidence, then why build this narrative in the full glare of media spotlight? Why is there a need for this?" she said in the letter.
The narrative Liew is referring to is IGP Khalid's public announcements on Pastor Koh's abduction, which she said was "vague, bordering on sensationalism" and peppered with "inconsistencies".
IGP Khalid previously warned the public, media, and NGOs that spoke about Pastor Koh's abduction to stop creating so much publicity regarding the case
"I am worried because the investigation seems to have come to deadlock because there is no new information regarding the pastor's disappearance. I believe this is because there has been way too much publicity regarding the pastor's disappearance.
"So, I once again urge the media, individuals, and NGOs who want to get involved in kidnap cases, to shut your bloody mouth!" he said during a press conference in late March, as reported by The Star.
Responding to that statement, Liew said she was "bewildered as to why you (IGP Khalid) have chosen to ignore your own advice".
In the five-page letter to the media, Liew also wished IGP Khalid a happy birthday and a good post-retirement life
"As such, I wish you a happy retirement and a blessed 60th birthday on 5th September. I pray that God will bless you and grant you a good life with your loved ones after your long service to the nation," she said.
After 40 years of serving in the police force, IGP Khalid will be retiring on 5 September 2017.
"After 200 days of this kind of treatment, my children and I are disappointed and exhausted. I do not know why you and the police have chosen to treat us this way. You have ignored the basic obligation to update the family of an abduction victim in a professional and compassionate manner," Liew added.
It was reported that Pastor Koh was abducted by a group of masked men in black SUVs along Jalan SS4B/10. The area is only about 100 metres away from the Police Housing Complex in Kelana Jaya.
He was last seen driving a Honda Accord car with the registration number ST 5515 D on Monday morning.
The authorities are still unsure of the motive of the abduction as no call for ransom has been made so far.
In mid-July, IGP Khalid told members of media that Pastor Koh's disappearance may be related to a human trafficking syndicate that was busted in Kedah and Perak in June.
"We believe this syndicate has links with groups in southern Thailand. We are working with our Thai counterparts to investigate further," he said, as reported by The Star.