In 1998, Kevorkian was arrested and tried for his direct role in a case of voluntary euthanasia on a man named Thomas Youk who suffered from Lou Gehrig’s disease or ALS. He was convicted of second-degree murder and served 8 years of a 10-to-25-year prison sentence. He was released on parole on June 1, 2007, on condition he would not offer advice, participate, nor be present in the act of any type of suicide involving euthanasia to any other person; as well as neither promote nor talk about the procedure of assisted suicide.

The Shipman Inquiry, a two-year-long investigation of all deaths certified by Shipman, which Dame Janet Smith chaired, examined Shipman's crimes. The inquiry identified 215 victims and estimated his total victim count at 250, about 80 per cent of whom were elderly women. Shipman's youngest-confirmed victim was a 41-year-old man, although suspicion arose that he had killed patients as young as four. He is the only British doctor known to be guilty of murdering his patients, although other doctors have been acquitted of similar crimes or convicted on lesser charges.

Fish was a suspect in at least five murders during his lifetime. He confessed to three murders that police were able to trace to a known homicide, and he confessed to stabbing at least two other people. Fish was apprehended on December 13, 1934 and put on trial for the kidnapping and murder of Grace Budd. He was convicted and executed by electric chair on January 16, 1936, at the age of 65.^[4][5][6] His crimes were dramatized in the 2007 film The Gray Man, starring Patrick Bauchau as Fish.

A memorial garden to Shipman's victims, called the Garden of Tranquillity, opened in Hyde Park, Hyde on 30 July 2005.

As of early 2009, families of over 200 of the victims of Shipman were still seeking compensation for the loss of their relatives. In September 2009, authorities announced that letters Shipman wrote in prison would be sold at auction, but following complaints from victims' relatives and the media, they withdrew the letters from the sale.

The forms needed for a cremation in England and Wales have had their questions altered as a direct result of the Shipman case. For example, the person(s) organising the funeral must answer, "Do you know or suspect that the death of the person who has died was violent or unnatural? Do you consider that there should be any further examination of the remains of the person who has died?"

Harold Shipman: Doctor Death, an ITV television dramatisation of the case, was broadcast in 2002; it starred James Bolam in the title role.

A documentary also titled Harold Shipman: Doctor Death, with new witness testimony about the serial killer, was shown by ITV as part of its Crime & Punishment strand on 26 April 2018. The programme was criticised as offering "little new insight".

A play titled Beyond Belief – Scenes From the Shipman Inquiry, written by Dennis Woolf and directed by Chris Honer was performed at the Library Theatre, Manchester, from 20 October to 22 November 2004. The script of the play comprised edited verbatim extracts from the Shipman Inquiry, spoken by actors playing the witnesses and lawyers at the inquiry. This provided a "stark narrative" that focused on personal tragedies.

The satirical artist Cold War Steve regularly features Harold Shipman in his work.

The Shipman Files: A Very British Crime Story, a three-part documentary by Chris Wilson, was broadcast on BBC Two, focussed on the victims and how he went undetected for so long.

In order to solve this dilemma, Ishikawa chose to neglect numerous infants, many of whom died as a direct result of this abuse. The exact number of victims is unknown, but it is estimated that she killed at least 103 babies. Almost all of the other midwives employed by the Kotobuki maternity hospital were disgusted by this practice and resigned from their positions.

Later she also attempted to garner payment for these murders. She and her husband Takeshi solicited large sums of money from the parents, claiming that it would be less than the actual expense of raising these unwanted children. A doctor, Shiro Nakayama, was also complicit in this scheme and aided the couple by falsifying death certificates. The Shinjuku ward office ignored their actions.

Japanese tradition also disputed the rights of infants. Cases of infanticide by a parent had been typically regarded as bodily injury resulting in death under the Criminal Code of Japan until 1907. Asahi Shimbun on January 17, 1948, describing their suspicion for 169 murders and her admitting "malice aforethought."

Harold Shipman had killed his victim through a lethal dosage using diamorphine . 
While according to, Miyuki Ishikawa by Absolute Crime, it says, "Through neglect, Miyuki killed somewhere between 103 and 169 infants. While the other midwives in the hospital knew of the practice, the local government ignored the deaths. This resulted in multiple midwives leaving the hospital."
Miyuki had neglected the children, showing a difference between both serial killers. She wouldn't show any of the children any care, food, water, etc. Resulting in their sad deaths.

Harold had no accomplices during his murders, he did them all by himself and would personally alter the death certificated for his victims. According to the same website, it says "Woodruff was convinced the document was a forgery, and that Shipman had murdered her mother, forging the will to benefit from her death."
This proves that, Harold had done all the dirty work by himself. He forged all the documents to make it seem that all of the murders were due to natural causes or causes explained on the death certificates.

According to the same websites as before, it says, "Dr. Shiro Nakayama drew up false death certificates for the infants that were killed, and Miyuki's husband went around asking the parents for large sums of money, telling them that it would be cheaper to pay them instead of raising the child." 
This establishes that, Miyuki had accomplices that helped her with her killing spree of defenseless children. Even her husband contributed to the murders, while Dr. Shiro Nakayama had contributed forged death certificates for the murdered children. Therefore showing a difference between the two murders. One had accomplices, one didn't. 
According to the same website as before it says, " On January 13, 2004, Shipman was discovered hanging in his prison cell at Wakefield, having used bed sheets tied to the window bars of his cell."
We know that Harold had hanged himself in his jail cell for his death, but for Miyuki there is no known cause for her death. Therefore showing another difference between the two serial killers.