She allegedly targeted patients who were close to death by tampering with their intravenous drips so another nurse on duty would have to inform the person's family of their death.
Kuboki reportedly denied any specific grudge against her patients, but said she found it hard to deal with deaths on her shift, and injecting the drips allowed her to control when her patients died.
Nishikawa died at the hospital on September 18, 2016, while another patient, Nobuo Yamaki, also 88, passed away two days later.
She'd timed it so her victims died when she wasn't at work - because she dreaded having to deal with grieving family members.
An autopsy was then carried out on another 88-year-old patient, Sozo Nishikawa, who had shared a room with Yamaki.
"It would be troublesome if that responsibility fell on me", Kuboki said.
Police believe that she deliberately contaminated the patients' intravenous drips with a disinfectant containing benzalkonium chloride, killing the first two victims in a matter of just hours.
Security cameras caught a former nurse, under arrest on suspicion of fatally poisoning a patient at a hospital here, walking inside the institution while carrying unnecessary drugs during a night shift after the incident, investigative sources said.
Giants, Redskins make picks in NFL's supplemental draft
The Player: Carter is estimated about 6-foot, 200 pounds, although he did not have time for a pro day to verify his measurables. In a year or two, perhaps the Giants will look back on the gamble they took Wednesday and nod in approval.
A series of disturbing incidents were then reported on the fourth floor where she worked in 2016, where nurses' uniforms were ripped and drinks were spiked with a foreign substance.
Investigators found tiny punctures in the rubber seals of the bags, indicating that the antiseptic had been injected into them.
When they examined all of the nurses' uniforms, they found the chemicals around a pocket on Kuboki's uniform.
Ms Kuboki became a nurse in 2008 and joined Oguchi Hospital in 2015 after working at another healthcare facility elsewhere in Japan. At least 48 patients died at the hospital in suspicious circumstances over a three-month period in 2016, Japanese newspaper Asahi Shimbun reported.
Doctors said Nishikawa died of natural causes, but Kuboki would later admit to injecting Nishikawa's intravenous drip bag with a disinfectant, The Guardian reported.
Trump has called on allied countries to meet or exceed the 2014 Wales summit goal of spending 2 percent GDP on defense spending. Since President Trump took office, he has been highly critical of the spending guideline put in place by the alliance.
When the items were analysed by Oxford University's Radiocarbon Accelerator Unit, more than 74% were found to be from after 1947. While the numbers of elephants being killed has dropped for the last five years, around 55 are still being killed every day.
More significantly, the case has revealed some new information on the current status of Apple's self-driving vehicle project. Apple has brought criminal charges against Zhang, and he could face up to 10 years imprisonment and a $250,000 fine.
Police continue to investigate whether the attempted murders of the Skripals are linked to the poisoning of Sturgess and the man. Earlier on Monday, the Kremlin said it would be "absurd" to suggest that Russian Federation was involved in Sturgess's death.
Former leader Peter Sagan was dropped by his Bora-Hansgrohe teammates and fell to 80th overall, three minutes behind. David Zabriskie also won a prologue on debut in 2005 but was later stripped of the victory for admitting to doping.
A Facebook group has been started to help support Denise Nickerson , who's recovering from a stroke she suffered in late June. However, TMZ reports that a pacemaker was put in and she needs to be fed through a feeding tube.
Prime Minister Ruhakana Rugunda made the announcement soon after police broke up a protest against the taxes. "It's not right. Colleagues, the Excise Duty (Amendment) Bill 2018 was presented to this August House, debated and passed by this Parliament.
A witness testified Dozier used a sledgehammer to break Greene's limbs so the corpse would fit in a plastic storage container. Nevada plans to carry out the first execution using fentanyl, a drug at the heart of the U.S. opioid epidemic, on Wednesday.
Companies continue to fill more positions and as such, job openings dropped to 6.64 million in May, down from 6.84 million. In May, the US quit rate, or the proportion of workers quitting their jobs, reached the highest level since 2001.
Such a patient's physician will first identify all the potential medical marijuana risks based on his/her medical condition . Officials say they received public comments related to petitions to add conditions to the list.
England V. Croatia, Winner Will Play France
Matt Reece, 25, who works in marketing, said England had far outperformed the low expectations of them when the tournament began. England's bid to reach the World Cup final ended in heartbreak and failure on a night of unbearable tension in Moscow.
Giancarlo Stanton loses out in AL All-Star fan vote
The results of the Final Vote to determine the last roster spot on the American League and National League All-Star teams are in. It's also well deserved after Segura's superb first half helped to anchor the Mariners infield and offense.
His last World Cup, says Dalic
She added that she is flying back to Croatia and would be watching the game as part of a joint birthday football celebration. Deschamps also suggested in his post-semifinal comments that the French side might have another gear to reach in the final.
Man with no arms stabbed stranger with his feet
The victim was treated for his injuries and Crenshaw was taken to jail and charged with aggravated battery, the report states. Crenshaw is well-known for selling paintings drawn with his feet to tourists on Miami's Lincoln Road mall.
Thai cave rescue: All 12 boys and their coach rescued
Thailand's junta chief told reporters on Tuesday that the group had been given a "minor tranquiliser" to help calm their nerves. People celebrated on Tuesday as divers evacuated some of the 12 boys and their coach trapped at Tham Luang cave in Chiang Rai .